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

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Batch Zonal Statistics to Spreadsheets?

I have a pretty immense amount of Zonal Statistics as Table computations to do, and would love to find a way to grab mean and variance values from the little .dbf tables ArcGIS creates and put them ...
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23 views

Is it possible to override default QGIS error messages?

From my QGIS plugin I would like to override/replace one of the the default QGIS error message ("The layer layer_url is not a valid layer and can not be added to the map") with my own message. I have ...
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61 views

Programatically export labels to CAD based on another field value

The problem: I have a fairly simple procedure to export both the polyline features (architectural cad layer) and the ID's (attribute fields from polygon features that fill the rooms in another layer) ...
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288 views

Converting GRIB to Geotiff with gdal_translate in Python

I want to extract each band from a GRIB (gridded binary from http://data-portal.ecmwf.int/data/d/interim_daily/) in a single Geotiff image. I´m using Python with gdal_translate in a QGIS backround, ...
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148 views

Problem with polygon overlay in raster stats using gdal

I am using the raster_stats module in python to calculate the mean carbon value for different sets of polygons. Here is the code that I am using: africa_sat = ...
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224 views

How do I smooth edges of polygons in QGIS?

Is there a built in function or plugin I can use to achieve smooth lines for my polygons instead of the blocky ones I have now?
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145 views

How can a script tool share (dynamic) variables among different modules?

I'm running a python script from the toolbox window (as a script tool). I have a second python (tkinter) module that I use as an input interface. Now, I know that the script tool can call the ...
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105 views

model to connect points with line and set the digitize direction according to height

I'm trying to develop a tool that connects a point layer (manholes) with lines (waste water pipes) and sets the line direction according to an height attribute acording to gravity(from high to low). ...
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220 views

Running python script outside of Arcmap's python console

My codes works fine in Arcmap's python windows. But when I try to run it in a command promt windows, It says that; ERROR 000837: The workspace is not the correct workspace type. But it works fine ...
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154 views

How to use GDAL on Heroku?

I have a geospatial python app that I want to use on Heroku. This is my requirements.txt file: Flask==0.10.1 Jinja2==2.7.2 MarkupSafe==0.19 Werkzeug==0.9.4 gunicorn==18.0 itsdangerous==0.23 ...
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290 views

Editing QGIS point layer: retrieve attributes of intersecting line layer

I'm creating a custom editing form using QGIS 2.0 and would like to modify the mouse event when creating a point. I've gotten a start by reading this thread: How to programatically check for a mouse ...
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40 views

Add a raster specifying the projection in pyqgis

I would like add an raster but I want to specify the projection. If I do : qgis.utils.iface.addRasterLayer(url,layerName) QGIS ask me to specify the projection. I want to this with python. How I ...
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43 views

Changing the symbology of layer when converting from Layer to KML using Python

Is it possible to change the symbology of a layer file using Python? I have a script that creates a layer file and converts it to kml, but every time I run it the symbology color in the kml of the ...
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69 views

Batch Clip (Editing Session)

I'm trying to correct some topology errors in my geodatabase, now focusing on two feature classes: grass and buildings. They must not overlap. However, there are plenty of spaces where the grass was ...
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165 views

PyQGIS Dialog Plugin not resetting

I have written a PostGIS search plugin that works pretty well, except two things that I just cannot figure out a solution 1) When the dialog closes and then is reopened the previous query is still in ...
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115 views

How can I draw features on GeoTIFF in Python?

I have a set of data (coords + value) and want to turn it into a heatmap in GeoTIFF. Should I calculate pixels and set them as array, or there are shortcuts? This is what I do now: driver = ...
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28 views

Able to circumvent QgsCredentials script called from Pre-execution

I've got a stored project that, when opened is connecting to my PostgreSQL DB, and is loading several layers. All good. I'm using a script that is called from Pre-execution (Processing/Options and ...
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142 views

ArcGIS Geoprocessing Service fails on data loading

I have a Desktop Script tool that works fine when run on desktop, but does not work when the results are turned into a geoprocessing serice. Running ArcGIS 10.2 on Desktop and 10.2 on server. I have ...
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121 views

Getting “Segmentation fault: 11” with ogr in Python

This is the code I'm trying to run: In [1]: from osgeo import ogr In [2]: datasource = ogr.Open('testdata.shp') In [3]: datasource.GetLayerCount() Out[3]: 1 In [4]: layer = ...
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607 views

How to use paths with non ASCII characters for subprocess calls with ArcGIS

I know that it is possible to create calls using unicode character encoding like \xf8 for non ASCII characters but how do I do it writing a path in a script just like: 'e:\gis\python_ø\notepad.exe' ...
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59 views

How to get the signal when the color changes in pyQGIS?

I would like to have the signal when the color of a vector layer is changed by the user. In the doc, there is a signal that seems to fit ...
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142 views

Install PyQGIS in virtualenv

Is it possible to install PyQGIS in virtual environment? I want to use rendering capabilities in my own application which runs using virtualenv.
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192 views

How to programmatically set a rule-based renderer in QGIS?

These days im in a process of developing a plugin , which highlights/change color of set of features in a vector layer depending on some calculation. i found nice article about QGIS – Rule based ...
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152 views

Kartograph - “projection not named”

The Kartograph package looks very promising, so I have been trying play around with it. As it turns out, I have been able to get the most basic map to work (the "world.json" example), but I could not ...
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77 views

header information is missing from image, after writing using opencv

I am doing complement of an image using open-cv python, while writing the image, open-cv is not writing the header information in the complemented image. my image data are in TIFF format. i am doing ...
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78 views

Automate data entry into Access from ArcMap

I have an Access 2007-2010 database that I'm currently working on by manually searching for roads in a defined set of areas in ArcMap 10.1 and then filling in the area's ID in an empty column in the ...
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434 views

Watershed delineation; how to program

I've been trying to roll my own watershed delineation program, taking a flow direction grid and pour points as input. I coded up a quick search algorithm in Python which inspects the flow direction ...
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116 views

Where are dynamic hyperlinks stored?

A while back (ArcGIS 10.0 times, or maybe even 9.3) a colleague of mine created a mxd with a few hundred manholes and attached dynamic hyperlinks to them (pointing to photos of them). (I know this ...
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213 views

How to utilize GPSQLExpression data type in Python Toolbox

I am trying to write my first Python Toolbox for ArcGIS (neat stuff by the way). The tool is simple enough - it connects to SQL Server and downloads data for the user. The trick here is, I want the ...
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144 views

Create custom “Export To” context menu tool using selected feature in ArcCatalog

I'm trying to create a custom "Export To" script similar to the Right-Click Export Content menu item "To Geodatabase... (multiple)". I have a 3 feature classes in a file geodatabase. I selected two of ...
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96 views

how can i export a shapefile

hi I want to select the cities that exist in Morocco and export it to a shape file and I used this code but its not working, it gives me an error: code: import arcpy from arcpy import env ...
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67 views

Arcpy PageLayout.dll Errors in Python

import os import arcpy arcpy.env.overwriteOutput=True folderPath= raw_input ("Enter directory: ") filePath= raw_input ("Enter data repository: ") f = open((os.path.join ...
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24 views

Q: cursor memory and fields therein

Theoretical Python question. Say you have an update cursor while-loop for a few selected records. While looping through the rows, at some point a nested if statement triggers an "addfield" event. The ...
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314 views

Calculating area with python qgis

I am a little stumped with determining the area of polygons in the python console. I want the output to be in meters^2, so using: qgis.utils.iface.mapCanvas().setMapUnits(0) ...
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207 views

Editing of vector layer programmatically with QGIS

I'm trying to edit vector layer using Python console and have couple of questions. Why this approach doesn't work and I have to use canvas.refresh? If I will use this code not in python console but in ...
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207 views

Unable to render layers in MapCanvas using PyQGIS/PyQt4

I am trying to get some layers into a MapCanvas and style them. I am following the PyQgis Cookbook info here but my code is just not working. I've been spinning my wheels on this for over a week now ...
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168 views

Is it possible to get field type information from FieldInfo object in ArcPy?

I'm looking at the FieldInfo object documentation for ArcGIS 10.2 and am not seeing access for field type (e.g. short, string, double). Is it possible to get field type information from the ...
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295 views

Locating the centroid (center of mass) of spherical polygons

I'm trying to work out how best to locate the centroid of an arbitrary shape draped over a unit sphere, with the input being ordered (clockwise or anti-cw) vertices for the shape boundary. The density ...
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69 views

Russian in fieldname changing with Python in ArcGIS

Is there any way to rename fieldname in the attribute table of a layer/shapefile in ArcGIS 10.2 containing russian letters? If yes, is it possible to do it in a script?
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70 views

How to create a startup prompt that populates definition queries on multiple feature classes

I would like to create an ArcGIS start up prompt or custom button that asks for a user's initials and then populates multiple feature class & layer definition queries. More specifically, I would ...
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71 views

Access to python addin objects/variables in python window

Following up on this question: Can a Python script be executed from a .NET AddIn and also write its standard output and geoprocessor messages to the ArcMap Python Window? Is is possible to access ...
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74 views

What is the best way to handle geometries between Python functions?

What is the best way to handle geometries between different Python functions? For example: I have a function that exports a line from grass.script. The line will be a parameter of another function ...
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176 views

GDAL and Python: How to “pad the extent” or otherwise handle band.ReadRaster() for area falling slightly outside the image bounds?

In a nutshell, I'm trying to create a bare-metal tiling utility using GDAL and Python. As you can see in the graphic below, which shows the perimeter of a raster and the OSM-structured tile index, ...
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215 views

Matplotlib Basemap Resolution with PyQt makes Python Quit Unexpectedly

I'm having difficulties using Matplotlibs Basemap in combination with a PyQt4 interface. Basically I create a Pyqt4 Canvas in which I plot a Matplotlib Basemap and some markers. I call the function in ...
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131 views

Efficient computation of path profile with Numpy and GDAL

I have numpy array with SRTM elevation data and I need calculate path profiles - vectors with elevation data from one point (transmitter) to every points of my map. Here's my current solution: def ...
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125 views

AttributeError: Error in getting tool information when using TableToTable tool

I am trying to use the arcpy.TableToTable_conversion tool in my python script, but seem to be getting the following error on the line arcpy.TableToTable_conversion("FINAL_NLPG", ...
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287 views

Couldn't load PyQGIS, QGIS 2.0.1 on Ubuntu 12.04 Precise

After upgrading to QGIS 2.0.1 I still get the error: Couldn't load PyQGIS. Python support will be disabled. Traceback (most recent call last): File "", line 1, in File ...
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74 views

Obtain virtual output directory path in geoprocessing service

I am publishing a geoprocessing service and I want to be able to access the virtual output directory path configured for the service. Now I know that gp services will magically return virtual paths ...
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101 views

How to join attributes by location with command line

I would like to joint the attributes of 2 shapefiles by location but with a command line (linux). This feature is easy in QGIS but it is VERY slow. Is there a way of doing this with ogr or pyqgis ? ...
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274 views

merge_management

Here is the edited code: import arcpy import os from arcpy import env set the environment settings env.workspace = "C:\RG\Kings County\Test.gdb" fcs = arcpy.ListFeatureClasses("Sub_NVF_*") ...