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

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Disable customized context menu for some cases using python

I create a python add-in tool to add new item to the context menu, but I want the new item enabled only when user right click on map when within a buffer of polyline feature. I haven't figure out how ...
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44 views

How to export the legend (Layers Panel) as an image in QGIS using the Python console?

I want to export the Legend (the Layers Panel) as an image using the python console.
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789 views

How can I get all the latitude, longitude coordinates/points inside a rectangular polygon drawn in google maps?

Google maps lets you obtain a valid address by clicking on houses or buildings one by one, but it would be much easier if you could draw a polygon on the map and get a list of all valid addresses ...
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121 views

QGIS 2.2.0 GRASS not worked

I use QGIS 2.2.0 on Windows 8 64 bit. I try to install use Standalone installer and OSGeo4W and still get the error And then i start GRASS C:\Program Files (x86)\GRASS 6.4.2>grass64 ╬╪╚┴╩└: ...
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45 views

Is is possible to run the QGIS python module server side?

I'm pretty new to programming but I want to use the QGIS python module on a server. Basically I am trying to create a JPEG map programatically on a server. I already have a python script to create ...
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66 views

Highlight paths between two points

I'm new to qgis and very sorry if this is a simple question to ask. IS there a way to highlight the available paths (roads) between two selected points in a road map(in qgis) ? I want to find the ...
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61 views

QGIS API changes from 2.0 to 2.2

I have the same program running on two different machine, one with Qgis 2.0 and the other Qgis 2.2. The machine running 2.2 doesn't seem to render the map canvas. I thought it was how I has creating ...
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42 views

Running algorithm from Processing takes much much longer time than doing it from Qgis GUI

I have a road layer with 32000 features, and I want to find all the intersections. when I use processing->SAGA -> convert polygon/line vertices to points, it is all done in less than 5 seconds. ...
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90 views

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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47 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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191 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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115 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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160 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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114 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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76 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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169 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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130 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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249 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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38 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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60 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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124 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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93 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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23 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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114 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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100 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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452 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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122 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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60 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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705 views

smoothing results from scipy griddata interpolatioin

I am using the griddata interpolation package in scipy, and an extrapolation function pulled from fatiando: import numpy as np import scipy from scipy.interpolate import griddata import ...
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70 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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324 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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99 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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81 views

Write raster with its attribute table and symbology

I am classifying lots of rasters and I'd like to automate the legend creation and symbology displaying for easy manipulation. Here is the kind of raster I'm dealing with: library(raster) r <- ...
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184 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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124 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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94 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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59 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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20 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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170 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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131 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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259 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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66 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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66 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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67 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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69 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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146 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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171 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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107 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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108 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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177 views

Composite bands produces a single band image

Running this produces a single band tif and not a three band image. Has anyone seen this before or can suggest ways to trouble shoot it? Input_Rasters = path + parentdir + "/" + dir + "/" + ...