Latest Contributions by DarrenWiens2

Do you want dynamic text in the layout of your map listing the tanks, or dynamic labels next to your features? ... View more

What does 'print sql' look like after you've built it? Afterthought: try escape-quoting the field name to retain the quotes (see the where clause explanation here for more options): sql = ' \"%s\" IN (%s)' % (polygon_code_field, codes) ... View more

Using arcpy, you can loop through each vertex (Points) on each Polyline. Points store the Z coordinates. Once you determine the minimum Z coordinate for each line, create a new point at the corresponding X, Y location. You will likely find the articles on Reading and Writing Geometries helpful. ... View more

For me, the most straight-forward method would be: 1.) Reclassify your raster into 1 (slope <15%), NoData (slope >=15%). 2.) Use Region Group to group connected polygons. Your buttes should be relatively small groups compared to the surrounding matrix. 3.) Use Con (or other filtering method of your choice) to remove the identified islands from the original raster. ... View more

Your basic workflow will be: - create a da.SearchCursor() to loop through each row. In the call to create the cursor, you will list all of your fields. - Loop through each field inside the cursor. If the value equals 1, add it to an SQL string that would fit into Select By Attributes, like: "POLYGON_ID" in ('A1','A2','C4', etc.) - Once you've looped through all fields, run Select tool using the constructed where clause ... View more

You can use Chris' suggestion to modify the number coming in through esri_measure, like so (or, at least, close - this is untested): Function FindLabel ( esri_measure )   highest_measure = X <-- ENTER THE HIGHEST MEASURE HERE & DELETE THIS COMMENT   new_measure = CStr((highest_measure + 1) - int(Left ( esri_measure , Len ( esri_measure )-2 )))   FindLabel = new_measure & "+00" End Function ... View more

Chris, you stopped reading the help page you linked to too early. "If you install and enable the Maplex for ArcGIS extension, weights work differently. With Maplex labeling, there are no label weights and there are separate settings for polygon feature weights and polygon boundary feature weights." In other words, turn on Maplex labeling, and set interior feature weight to 1000. ... View more

For rectangles produced by the out-of-the-box MBG tool, the length and width are automatically calculated (and there are no license restrictions). ... View more

Are you asking how to subtract one column from another? Please consult the Calculate Field examples. ... View more

You can exclude a lot of candidates by running Minimum Bounding Geometry (geometry type = RECTANGLE_BY_WIDTH). If neither MBG_Width nor MBG_Length are greater than 3000', it can't have a line of sight greater than 3000' (at least, I can't think of a situation where this could be true). edit: it looks like you can use GME's Calculate Fetch in Polygons, however it may take a long time without excluding noncandidates as described above. ... View more

A quick search yielded this Knowledge Base Article (Select minimum and maximum values in the Select By Attributes dialog box) explaining that this cannot be done in File GDBs and these solutions, which are probably more complicated than you want to see, on GIS StackExchange. ... View more

To be honest, I'm not the best person to answer this question because I don't know the default behaviour (which I assume would be to use the .jgw file if the projection info is not found in the image header), but this link shows you how to force ArcMap to use the world file, under ArcMap Options (see the bottom of the page). If that still fails, open the .prj or .jgw in a text editor to determine the desired projection, then define the coordinate system yourself. ... View more

...or symbolize your layer by category, which lists the feature count matching each attribute value. ... View more