Calculating perpendicular line only works for shapefiles not for feature class

adriana

In ArcGIS I'm trying to use this field calculator expression on field Shape to generate a perpendicular line, of 0.01m length, at the midpoint of each existing line feature:

<SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">CALCULATE FIELD </SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">(</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">data management</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">):</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;"></SPAN><SPAN class="" style="color: #2b91af; border: 0px; font-weight: inherit; font-size: inherit;">Input</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;"> table</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">:</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;"> </SPAN><SPAN class="" style="color: #2b91af; border: 0px; font-weight: inherit; font-size: inherit;">Clip_point_buffer</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;"></SPAN><SPAN class="" style="color: #2b91af; border: 0px; font-weight: inherit; font-size: inherit;">Field</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;"> name</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">:</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;"> </SPAN><SPAN class="" style="color: #2b91af; border: 0px; font-weight: inherit; font-size: inherit;">Shape</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;"></SPAN><SPAN class="" style="color: #2b91af; border: 0px; font-weight: inherit; font-size: inherit;">Expression</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">:</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;"> </SPAN><SPAN class="" style="color: #2b91af; border: 0px; font-weight: inherit; font-size: inherit;">RotateExtend</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">(</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;"> </SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">!</SPAN><SPAN class="" style="color: #2b91af; border: 0px; font-weight: inherit; font-size: inherit;">Shape</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">!,</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;"> </SPAN><SPAN class="" style="color: #7d2727; border: 0px; font-weight: inherit; font-size: inherit;">0.01</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">)</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;"></SPAN><SPAN class="" style="color: #2b91af; border: 0px; font-weight: inherit; font-size: inherit;">Expression</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;"> type</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">:</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;"> </SPAN><SPAN class="" style="color: #2b91af; border: 0px; font-weight: inherit; font-size: inherit;">Python</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;"></SPAN><SPAN class="" style="color: #2b91af; border: 0px; font-weight: inherit; font-size: inherit;">Code</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;"> </SPAN><SPAN class="" style="color: #2b91af; border: 0px; font-weight: inherit; font-size: inherit;">Block</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">:</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">&nbsp; </SPAN><SPAN class="" style="color: #2b91af; border: 0px; font-weight: inherit; font-size: inherit;">Pre</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;"> logic script code</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">:</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;"></SPAN><SPAN class="" style="color: #101094; border: 0px; font-weight: inherit; font-size: inherit;">def</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;"> </SPAN><SPAN class="" style="color: #2b91af; border: 0px; font-weight: inherit; font-size: inherit;">RotateExtend</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">(</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">plyP</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">,</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">sLength</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">):</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">l</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">=</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">plyP</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">.</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">length ptX</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">=</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">plyP</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">.</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">positionAlongLine </SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">(</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">l</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">/</SPAN><SPAN class="" style="color: #7d2727; border: 0px; font-weight: inherit; font-size: inherit;">2</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">).</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">firstPoint ptX0</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">=</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">plyP</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">.</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">firstPoint ptX1</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">=</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">plyP</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">.</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">lastPoint dX</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">=</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">float</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">(</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">ptX1</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">.</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">X</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">)-</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">float</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">(</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">ptX0</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">.</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">X</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">)</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">dY</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">=</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">float</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">(</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">ptX1</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">.</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">Y</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">)-</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">float</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">(</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">ptX0</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">.</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">Y</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">)</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">lenV</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">=</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">math</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">.</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">sqrt</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">(</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">dX</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">*</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">dX</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">+</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">dY</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">*</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">dY</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">)</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">sX</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">=-</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">dY</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">*</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">sLength</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">/</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">lenV</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">;</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">sY</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">=</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">dX</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">*</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">sLength</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">/</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">lenV leftP</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">=</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">arcpy</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">.</SPAN><SPAN class="" style="color: #2b91af; border: 0px; font-weight: inherit; font-size: inherit;">Point</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">(</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">ptX</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">.</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">X</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">+</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">sX</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">,</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">ptX</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">.</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">Y</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">+</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">sY</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">)</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">rightP</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">=</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">arcpy</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">.</SPAN><SPAN class="" style="color: #2b91af; border: 0px; font-weight: inherit; font-size: inherit;">Point</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">(</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">ptX</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">.</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">X</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">-</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">sX</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">,</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;"> ptX</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">.</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">Y</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">-</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">sY</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">)</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">array </SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">=</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;"> arcpy</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">.</SPAN><SPAN class="" style="color: #2b91af; border: 0px; font-weight: inherit; font-size: inherit;">Array</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">([</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">leftP</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">,</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">rightP</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">])</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">section</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">=</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">arcpy</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">.</SPAN><SPAN class="" style="color: #2b91af; border: 0px; font-weight: inherit; font-size: inherit;">Polyline</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">(</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">array</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">)</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;"></SPAN><SPAN class="" style="color: #101094; border: 0px; font-weight: inherit; font-size: inherit;">return</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;"> section </SPAN><SPAN class="" style="color: #2b91af; border: 0px; font-weight: inherit; font-size: inherit;">Shape</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">:</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;"></SPAN><SPAN class="" style="color: #2b91af; border: 0px; font-weight: inherit; font-size: inherit;">RotateExtend</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">(</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;"> </SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">!</SPAN><SPAN class="" style="color: #2b91af; border: 0px; font-weight: inherit; font-size: inherit;">Shape</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">!,</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;"> </SPAN><SPAN class="" style="color: #7d2727; border: 0px; font-weight: inherit; font-size: inherit;">0.01</SPAN><SPAN class="" style="color: #303336; border: 0px; font-weight: inherit; font-size: inherit;">)</SPAN>

It works if I do it with a shapefile, but it doesn't work if I try to do it in this same shapefile imported as a feature class in a database (.gbd). The database has a tolerance 0.001 and the default resolution (0.0001). Why the process does not work when the feature is in a database?

I've read that it might have something to do with the properties of "Shape" type of field, because it's locked when in a database. If that's the error, how could I obtain the same results working with a feature class in a database?

XanderBakker

Below an example of what I mean:

<SPAN class="keyword token">def</SPAN> <SPAN class="token function">main</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">import</SPAN> arcpy

&nbsp;&nbsp;&nbsp; <SPAN class="comment token"># input and output featureclass</SPAN>
&nbsp;&nbsp;&nbsp; fc_in <SPAN class="operator token">=</SPAN> r<SPAN class="string token">'C:\GeoNet\Streets\GeoNet Street Sample.gdb\LebStreetSample_MP2SP'</SPAN>
&nbsp;&nbsp;&nbsp; fc_out <SPAN class="operator token">=</SPAN> r<SPAN class="string token">'C:\GeoNet\Streets\GeoNet Street Sample.gdb\test_perp_v08'</SPAN>
&nbsp;&nbsp;&nbsp; line_length <SPAN class="operator token">=</SPAN> <SPAN class="number token">100.0</SPAN>&nbsp; <SPAN class="comment token"># lenth of output perpendicular line</SPAN>
&nbsp;&nbsp;&nbsp; tolerance <SPAN class="operator token">=</SPAN> <SPAN class="number token">1.0</SPAN>&nbsp; <SPAN class="comment token"># distance from mid point to determine angle</SPAN>

&nbsp;&nbsp;&nbsp; feats <SPAN class="operator token">=</SPAN> <SPAN class="punctuation token">[</SPAN><SPAN class="punctuation token">]</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">with</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>da<SPAN class="punctuation token">.</SPAN>SearchCursor<SPAN class="punctuation token">(</SPAN>fc_in<SPAN class="punctuation token">,</SPAN> <SPAN class="punctuation token">(</SPAN><SPAN class="string token">'SHAPE@'</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="keyword token">as</SPAN> curs<SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">for</SPAN> row <SPAN class="keyword token">in</SPAN> curs<SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; polyline_in <SPAN class="operator token">=</SPAN> row<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; polyline_out<SPAN class="operator token">=</SPAN> GetPerpendicularLine<SPAN class="punctuation token">(</SPAN>polyline_in<SPAN class="punctuation token">,</SPAN> tolerance<SPAN class="punctuation token">,</SPAN> line_length<SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; feats<SPAN class="punctuation token">.</SPAN>append<SPAN class="punctuation token">(</SPAN>polyline_out<SPAN class="punctuation token">)</SPAN>

&nbsp;&nbsp;&nbsp; arcpy<SPAN class="punctuation token">.</SPAN>CopyFeatures_management<SPAN class="punctuation token">(</SPAN>feats<SPAN class="punctuation token">,</SPAN> fc_out<SPAN class="punctuation token">)</SPAN>


<SPAN class="keyword token">def</SPAN> <SPAN class="token function">GetPerpendicularLine</SPAN><SPAN class="punctuation token">(</SPAN>polyline<SPAN class="punctuation token">,</SPAN> tolerance<SPAN class="punctuation token">,</SPAN> length<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp; pntg1 <SPAN class="operator token">=</SPAN> polyline<SPAN class="punctuation token">.</SPAN>positionAlongLine<SPAN class="punctuation token">(</SPAN>polyline<SPAN class="punctuation token">.</SPAN>length<SPAN class="operator token">/</SPAN><SPAN class="number token">2.0</SPAN> <SPAN class="operator token">-</SPAN> tolerance<SPAN class="punctuation token">,</SPAN> <SPAN class="token boolean">False</SPAN><SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp; pntg2 <SPAN class="operator token">=</SPAN> polyline<SPAN class="punctuation token">.</SPAN>positionAlongLine<SPAN class="punctuation token">(</SPAN>polyline<SPAN class="punctuation token">.</SPAN>length<SPAN class="operator token">/</SPAN><SPAN class="number token">2.0</SPAN> <SPAN class="operator token">+</SPAN> tolerance<SPAN class="punctuation token">,</SPAN> <SPAN class="token boolean">False</SPAN><SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp; angle <SPAN class="operator token">=</SPAN> getAngle<SPAN class="punctuation token">(</SPAN>pntg1<SPAN class="punctuation token">,</SPAN> pntg2<SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp; angle_perp <SPAN class="operator token">=</SPAN> angle <SPAN class="operator token">+</SPAN> <SPAN class="number token">90</SPAN>
&nbsp;&nbsp;&nbsp; pntg_from <SPAN class="operator token">=</SPAN> polyline<SPAN class="punctuation token">.</SPAN>positionAlongLine<SPAN class="punctuation token">(</SPAN><SPAN class="number token">0.5</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="token boolean">True</SPAN><SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp; pntg_to <SPAN class="operator token">=</SPAN> pntg_from<SPAN class="punctuation token">.</SPAN>pointFromAngleAndDistance<SPAN class="punctuation token">(</SPAN>angle_perp<SPAN class="punctuation token">,</SPAN> length<SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'PLANAR'</SPAN><SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp; polyline_new <SPAN class="operator token">=</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>Polyline<SPAN class="punctuation token">(</SPAN>arcpy<SPAN class="punctuation token">.</SPAN>Array<SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">[</SPAN>pntg_from<SPAN class="punctuation token">.</SPAN>firstPoint<SPAN class="punctuation token">,</SPAN> pntg_to<SPAN class="punctuation token">.</SPAN>firstPoint<SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">,</SPAN> polyline<SPAN class="punctuation token">.</SPAN>spatialReference<SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">return</SPAN> polyline_new


<SPAN class="keyword token">def</SPAN> <SPAN class="token function">getAngle</SPAN><SPAN class="punctuation token">(</SPAN>pntg1<SPAN class="punctuation token">,</SPAN> pntg2<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="string token">'''determine angle of line based on start and end points geometries'''</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">return</SPAN> pntg1<SPAN class="punctuation token">.</SPAN>angleAndDistanceTo<SPAN class="punctuation token">(</SPAN>pntg2<SPAN class="punctuation token">,</SPAN> method<SPAN class="operator token">=</SPAN><SPAN class="string token">'PLANAR'</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN>

<SPAN class="keyword token">if</SPAN> __name__ <SPAN class="operator token">==</SPAN> <SPAN class="string token">'__main__'</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp; main<SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

Which generates the perpendicular lines and the mid point of the polyline, with the specified length.