Python is an open source interpreted programming language used in many GIS programs.

learn more… | top users | synonyms

0
votes
2answers
321 views

FME API Module null?

I try to convert my geodatabase to Excel. And i have a strange message: FME API version of module 'XLS_ADO' matches current internal version (3.6 20101014) Trying to find a DYNAMIC plugin ...
0
votes
1answer
385 views

Calculating length with Python and the PYTHON_9.3

(Please critic wholly if possible) If I have polyline data in NAD83 and I want to calculate geometry using the PYTHON_9.3 parameter from the arcgisscripting.create(9.3), I am getting mixed results. If ...
0
votes
1answer
319 views

Eliminating a column from a copied feature class via a fieldmap object in ArcGIS Python

The use case is exporting a feature class via a Python script (arcgisscripting v9.3x. Only a few of the columns are needed in the result feature class. I commonly use the fieldmappings/fieldmap ...
0
votes
1answer
54 views

Python Scripting Error (Adding a Field)

I'm using this code as a python script tool in ArcGIS 10.1: import arcpy, os arcpy.env.workspace = r'W:\S&P\s&p techs\Emily\Errors.gdb' #Looping through dissolved feature classes, adding ...
0
votes
1answer
25 views

equation solving by using python or model builder in arcmap 9.3

I want to solve one formula in arcmap 9.3 by using Python or Model builder. I have one shape file, in that there is in attribute table for field A & B Solve the formula: A*B/Sum(A). where Sum(A) ...
0
votes
1answer
30 views

Add multiple GDB files in subdirectories to mxd using python

I have GDB files located in many sub-Folders and sub-sub-Folders. All Sub Folders are located in one large directory i asked it for layer file in Add multiple Layer files in subdirectories to mxd ...
0
votes
1answer
30 views

Merging multiple feature classes into one using Python

So I have feature classes from an ArcGIS database that I renamed using this Python code: But now I have to merge all the feature classes that are output from this into one feature class named ...
0
votes
4answers
72 views

arcpy interate row, in a python script? SQL Select expression not working

I am creating a python script where I am trying to iterate over point feature class. I want to create seperate Feature classes from each individual day. So select daynumber and then export it to a new ...
0
votes
1answer
71 views

How do I create a projection file using GDAL

I am trying to obtain a buffer from a polyline file using GDAL with the following function def createBuffer(inputfn, outputBufferfn, bufferDist): inputds = ogr.Open(inputfn) inputlyr = ...
0
votes
1answer
84 views

TypeError: 'NoneType' object is not iterable from Python Scripting for Geoprocessing Workflow exercise?

I am currently taking ESRI's Python Scripting for Geoprocessing Workflows. I have following their step by step however there seem to be a problem that I am getting an error. import arcpy #Set ...
0
votes
2answers
39 views

Construct sql expression with python tool and pass it as argument to Select tool

I am trying to construct an sql expression using python and afterwards pass it as an input to the arc catalogue select tool. As shown in the following image I am passing a station_ID as a string to my ...
0
votes
1answer
27 views

combine two FOR LOOPS (MakeFeatureLayer_management)

I want to combine two FOR LOOPS but I have no idea how. It should give me in each TYPE Layer "under" Layers, where are new Layers for each MONTH (see picture) The two loops in itself works. # ...
0
votes
2answers
70 views

UpdateLayer with arcpy

I am trying to use updatelayer in three mxd's. Each mxd has 3 data frames. I am getting an error, can anyone help? import arcpy,os,sys,string import arcpy.mapping from arcpy import env env.workspace ...
0
votes
1answer
35 views

How to set the spatial reference to a OGR layer using the Python API?

I create new a Ogr Layer with the Datasource.GetLayer() method: driver = ogr.Open(input_file).GetDriver() datasource = driver.Open(input_file, 0) input_layer = datasource.GetLayer() If the input ...
0
votes
1answer
77 views

Error 000728 field does not exist within table - field already exists

I am running arcpy.AddField_management to add a field called "cnid" and update it with x centroid values. For add.field I get the error "cnid" already exists. I tried print.field name and I cannot ...
0
votes
1answer
56 views

How to round up/down an pixel value of a raster to a pixel value with 2 decimal places?

I have a raster (DTM) with floating points as pixel value. Now i want to round up/down the pixel values (to its next nearest value) to 2 decimal places. I use ArcGIS (with extensions) and tried the ...
0
votes
1answer
55 views

Replace a feature class in a feature class list

I'm using arcpy with arcgis 10.0. I try a script that erase successively all the feature class of a list depending on a reliability field value. Each time a feature class is erased by an other one, I ...
0
votes
1answer
69 views

Add CAD feature class to Arcgis using arcpy

I'm trying to add a CAD layer (point, polyline, annotation...etc) into ArcMap by python code, i'm using Arcgis 10.1, IDLE(Python 2.7), I faced many codes but they all gives errors, so i'm blocked ...
0
votes
1answer
50 views

Replace Domains of ArcGIS 10.1

I need to Replace the Domain on Field level on my Geodatabase. My Geodatabase having multiple features and tables where at each on field one Domain is assigned, I need to replace that Domain and ...
0
votes
1answer
55 views

VB to Python for Labeling in ArcGIS 10.2.1

I am really new to Python and do not understand VB. I need to convert this VB script to Python. I think it may take me a few weeks to figure out but if someone helps me I would be grateful. The code ...
0
votes
1answer
82 views

Python Script to Identify and Flip Lines Digitized in the Wrong Direction

I have a river dataset that was digitized both in the direction of flow and opposite the direction of flow. I need to find an automated method to determine which lines were digitized from downstream ...
0
votes
1answer
43 views

Python buffer in a line using GDAL

I am trying to make a buffer from a line using gdal. I use the example in the gdal Cookbook import ogr, os def createBuffer(inputfn, outputBufferfn, bufferDist): inputds = ogr.Open(inputfn) ...
0
votes
5answers
57 views

Aligning Raster Over the Polygon

I have a raster image which have to be aligned over the polygon. Both the raster and polygon have the same coordinate system. The figure shows the raster image which has to be fitted over the RED ...
0
votes
2answers
16 views

Error with layer.pendingAllAttributesList

While coding to obtain individual layers' attributes (field) list, I am stymied by the code. I can identify a specific layer: MyLayer = QgsMapLayerRegistry.instance().mapLayersByName("TestPoint") ...
0
votes
3answers
48 views

Empty shapefile after project tool in a for loop

I am running a for loop to process a years worth of data. The entire script runs fine for the first run through, but when it runs again (when date is 1/2/2013), I get the following error: 'NoneType ...
0
votes
1answer
80 views

How to make polygons clickable in Leaflet.js / folium

I'm trying to create a clickable leaflet.js map using folium and Python. After a previous query - answered here Geopandas/folium map not displaying - I've added the polygons. But I'm getting a ...
0
votes
2answers
52 views

Understanding EOL while scanning string literal from Reclassify in ArcPy?

I'm trying to reclassify a raster using a Python script. I know I can just use the tool in ArcMap, but I want to start understanding the code behind it. Can anyone tell me why this doesn't work ...
0
votes
2answers
123 views

Writing Python script in Field Calculator in ArcGIS Desktop?

I'm a programmer, I have programmed in C#, Java, but not with Python. And I'm not a geographic worker. How can I write a python script into Field Calculator to be able to check the other column value. ...
0
votes
1answer
68 views

Creating Map from database

I'd like some general advice on creating dynamic maps. I have a bunch of geospatial points saved on SQL Server and PostgreSQL. People will enter new data into the databases from time to time. I want ...
0
votes
1answer
74 views

Arcpy MakeFeatureLayer won't loop

The arcpy snippet below is intended to generate a list of technicians scheduled to work, and then generates a unique feature layer for each one's stops. fcStops = "TaskRoute1016" with ...
0
votes
2answers
118 views

How to calculate cumulative decreasing sum in ArcGIS-10.2

I need to calculate the cumulative decreasing sum as a field in a rasters attribute table. The cumulative decreasing sum is the accumulation of the last values to the first, so it is basically the ...
0
votes
2answers
104 views

Select Layer by Attribute: SQL and variable problems

I've had a good look around the site and haven't been able able to find any 'select by attribute' questions regarding string variables and how to integrate them into an SQL statement. In my particular ...
0
votes
2answers
138 views

Improving this script - GPX reading and processing with Python OGR

I am trying to plot every GPX trace I have in a folder, by reading it with Python-OGR, clipping it by a bounding box, and plotting Curently I have a working script, but it seems very uggly, and I ...
0
votes
1answer
94 views

Create Georeferenced Raster For JPEG file with Mapnik Python

I am able to use Mapnik generate_image.py to generate image with a BBOX and projection. Also, I have added a python script to generate a JGW file. But to completely georeference the generated image. ...
0
votes
1answer
24 views

Detecting Runtime Errors in Arcpy Loops [duplicate]

I am looping over a feature in Arcpy and doing several geoProcessing tasks on each feature/iteration. The loop runs pretty well but crashes on some of the features. I dont really know why but its ...
0
votes
1answer
68 views

python code to create an intersection loop with a geodatabase [closed]

I am trying create a loop that will intersect each individual township with a statewide section layer. I am having trouble with the syntax of the intersect tool I think, but maybe it is something ...
0
votes
1answer
36 views

Rank cell values across multiple grids [closed]

I have multiple grids, one for each month of a year. I would like to create a new grid for each month/year combination that the cell value is the percentile rank of that cells value in the grid stack. ...
0
votes
1answer
57 views

Central Feature Tool Key Error u'M'

I was trying to execute two tools (Mean Center Tool and Central Feature) when suddenly it gave me a error that I couldn't find the resolution too no matter what I tryed. The code is here (along with a ...
0
votes
1answer
49 views

How can I efficiently use a list comprehension on an ogr.layer inside a loop in Python?

Problem statement I'm using python 2.7 and ogr 1.11.0 on Windows 7. I have two shapefiles: one for streets and one for junctions. The streets shapefile has fields listing the IDs of the start and ...
0
votes
1answer
46 views

Adding a Vertex To Exisiting Feature(linear) Using OGR Python

I am working on a project that involves finding the intersection of linears in a shapefile, if that vertex(the found intersection) doesn't already exist for each(or one) of the features, then that ...
0
votes
2answers
137 views

gdal2Tiles output differs from MapTiler

I'm in need to process a large batch of Landsat images with MapTiler and since the version I'm using (1.0 Beta 2) does not support multiple input files, I created a simple python script that calls ...
0
votes
1answer
73 views

What is the syntax for Python 2.7 to permanent display in percent in a field column?

What is the syntax to build to calculate field, for example, Acres to Percent? 841173.00 to 82 % What I want the field column in Percent to be display numbers with percent with the alignment to ...
0
votes
1answer
95 views

Python for loop doesn't work for Spatial ETL Tool

I've created a Spatial ETL tool from ArcGIS 10.1 and would like to run this tool to all 200 featureclasses in a geodatabase. Therefore, I've written a python script to do this automation. (btw, i'm ...
0
votes
1answer
499 views

Create polylines from point array Python

I am working on building polylines from an array of points I have created from a csv file and am completely lost in building the lines. My code works as follows: I have the point array working, I need ...
0
votes
1answer
84 views

Converting Raster datasets into layers using ArcPy/ModelBuilder?

I am new to ArcGIS and ArcPy (just started using them on Wednesday). I am using a model to create a Point Density plot from a Shape File, with the output being a Raster dataset. I want to ...
0
votes
1answer
153 views

Issue using Matplotlib in QGIS

I am developing a QGIS-plugin and for graphing I want to use matplotlib, like many other QGIS -plugins. This worked fine under linux, but under windows with QGIS2.4 I am experiencing problems. I ...
0
votes
1answer
273 views

Arcpy Subtracting rasters error - TypeError: 'unicode' object is not callable

I have a script which subtracts 2 versions of the same raster from each other (one newer than the other) and then extracts the additions & deletions that have happened. I created a simple test ...
0
votes
1answer
233 views

Using Union on multiple shapefiles to output single result

Using QGIS 2.2 and Python, I would like to use the Union algorithm on multiple shapefiles (contained in a folder TEST) which would then produce single shapefile containing all the data. Currently ...
0
votes
1answer
40 views

Adding field to table without path to table (python) [closed]

I want to add a field to my table in the FieldCalculator. import arcpy arcpy.AddField_management("veg8", "test", "TEXT") An error message occured doing this and I figured out that I need to set a ...
0
votes
1answer
217 views

Using Z and M feature geometry to create line graph in ArcPy/Python?

I am a Python (v2.6.5) noob trying to plot a series of 3D polylines into graphs. So far I've come up with: # Import system modules import arcpy, os, sys, string from arcpy import env ...