topic Wrong cell values after conversion to a NumPy-Array? in Python Questions https://community.esri.com/t5/python-questions/wrong-cell-values-after-conversion-to-a-numpy/m-p/657410#M51141 <HTML><HEAD></HEAD><BODY><P>Hello Comunity,</P><P style="min-height: 8pt; padding: 0px;">&nbsp;</P><P>Due to my Bachelor Thesis I am working on some python-scripts für ArcGIS.</P><P>At the Moment, I develop a script for rastermanipulation by modifying the cell values. My dataset contains cell values from 1,000093 to 4,43723 metres, on which I want to perform some height-modification. Therefore, I convert the raster to a NumPy-array, which contains surprisingly cell values from -3,40282e+038 to 4,43723 metres.</P><P>How does this min-value came across my data?</P><P>I guess, it is a "nodata"-value which cause probles with the "float32"-datatype, but I am not sure.</P><P>Maybe I can find some help around here.</P><P style="min-height: 8pt; padding: 0px;">&nbsp;</P><P>Regards,</P><P>André</P></BODY></HTML> Wed, 15 Oct 2014 10:09:07 GMT AndréBaldauf 2014-10-15T10:09:07Z Wrong cell values after conversion to a NumPy-Array? https://community.esri.com/t5/python-questions/wrong-cell-values-after-conversion-to-a-numpy/m-p/657410#M51141 <HTML><HEAD></HEAD><BODY><P>Hello Comunity,</P><P style="min-height: 8pt; padding: 0px;">&nbsp;</P><P>Due to my Bachelor Thesis I am working on some python-scripts für ArcGIS.</P><P>At the Moment, I develop a script for rastermanipulation by modifying the cell values. My dataset contains cell values from 1,000093 to 4,43723 metres, on which I want to perform some height-modification. Therefore, I convert the raster to a NumPy-array, which contains surprisingly cell values from -3,40282e+038 to 4,43723 metres.</P><P>How does this min-value came across my data?</P><P>I guess, it is a "nodata"-value which cause probles with the "float32"-datatype, but I am not sure.</P><P>Maybe I can find some help around here.</P><P style="min-height: 8pt; padding: 0px;">&nbsp;</P><P>Regards,</P><P>André</P></BODY></HTML> Wed, 15 Oct 2014 10:09:07 GMT https://community.esri.com/t5/python-questions/wrong-cell-values-after-conversion-to-a-numpy/m-p/657410#M51141 AndréBaldauf 2014-10-15T10:09:07Z Re: Wrong cell values after conversion to a NumPy-Array? https://community.esri.com/t5/python-questions/wrong-cell-values-after-conversion-to-a-numpy/m-p/657411#M51142 <HTML><HEAD></HEAD><BODY><P>when running function <STRONG style="color: #4d4d4d; font-family: Arial, Helvetica, sans-serif;">RasterToNumPyArray (in_raster, {lower_left_corner}, {ncols}, {nrows}, {nodata_to_value})</STRONG></P><P>try setting the <SPAN style="font-family: arial, helvetica, 'helvetica neue', verdana, sans-serif;">-3,40282e+038 </SPAN>for the nodata_to_value parameter.</P><P></P><P>It could also be a product of the way the numpy creates it's arrays, by creating the array 1st with dummy values and then going and updating the values that correspond to the raster.</P></BODY></HTML> Wed, 15 Oct 2014 13:05:56 GMT https://community.esri.com/t5/python-questions/wrong-cell-values-after-conversion-to-a-numpy/m-p/657411#M51142 DallasShearer 2014-10-15T13:05:56Z