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

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With QGIS Plugins/PluginBuilder, how to prevent 2nd instance of Plugin from starting

I am using QGIS 2.6.0, with PluginBuilder 2.0.3 [checking the version, I just noticed that the 2.1.0 update is available] I am writing a plugin; it installs and runs. While running, I am able to ...
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227 views

Generate random points in polygon. Algorithm question

i created a Random Point Generator in python using the algorithm described here by @whuber. The algorithm is implemented using Shapely, PostGIS and psycopg2. To boost performance pythons ...
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187 views

With QGIS, why use QT Designer tools for creating Slots/Signals/ etc, if plugin coding can do it alone

I am curious why there is facility within QT Designer to create signals and slots as, to my surprise, I did not need to do this. All of the necessary coding was accomplished completely within the ...
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152 views

Python Band.SetNoDataValue(), sets all bands at once

Can someone tell me what I am doing wrong? I want to set bands 1 and three to 255, and band 2 to 0. The code below only should only set band 2, but gdalinfo shows that all bands get set to 0. Ubuntu ...
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50 views

How to find QGIS or QT or Python object definitions

I am attempting a simple plugin, on QGIS 2.6, using the available QT Designer installed I have successfully loaded a plugin, and can display a dialog box with widgets, within, and now attacking ...
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76 views

Fiona write crashes

I am trying to write a new shapefile with fiona but after creating the features, i keep getting this output after the program crashes: The program '[6668] python.exe' has exited with code -1073741819 ...
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36 views

ArcGIS script for mapping lat/long coordinates to boxes/rectangles? [duplicate]

Working on a project that requires me to take lat/long coordinates and map them as rectanglular boxes on ArcMap 10.1. To be clear, the upper left & lower right corners of each box/rectangle are ...
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34 views

How do I make arcpy exclude frozen / off layers while importing a DWG file?

I'm attempting to update existing GIS feature classes (SDE) using master AutoCAD files but end up importing ALL features present in the AutoCAD drawing regardless of the visibility settings (frozen / ...
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170 views

How can we merge the two selected features in a vector layer

I have taken one feature and find which are the neighbouring features to the feature which i have taken and then i have combine all those neighbouring features with my feature to make one feature. i ...
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93 views

PyQGIS setSubsetOfFields function in QGIS 2.4

I found the function setSubsetOfFields to filter fields in a layer in the PyGIS cookbook: ...
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2answers
113 views

QGIS Deployment in Citrix XenApp - How to Remove Pyramids from the image “properties”

I'm working on deploying QGIS 2.4 into a XenApp 6.5 desktop environment. We've tested QGIS to see if it will run in our environment on a test server and have found that building Pyramids with ...
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141 views

Asset point IDs, pipeline and flow direction

I have a data set of a sewage pipe network and point data (assets). I would like to: first calculate the flow direction of pipes (polyline feature) assign IDs to the pipelines using asset IDs ...
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100 views

Iterating an ArcGIS tool over multiple Fields with selection boxes

I have one shapefile that contains many fields and I'd like to write a simple script tool that allows me to run IDW for the fields I select. Is this possible? For example..... Input: 1 shapefile ...
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102 views

Error Loading Layer/Shapefile in a Standalone Python QGis Application

I tried loading a shapefile on Python using PyQgis API but to no avail. I double-checked the path to shapefile and found it to be correct. QGIS module also seems to be imported just fine. When I ...
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1answer
106 views

Use subprocess module to run GDAL processes

I am attempting to write a python script that will reproject & merge a series of .tif files then clip them to the boundaries of a .shp file. I have successfully used the subprocess module to do ...
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32 views

Identify, get, recover ArcGIS for Server (AGS) user?

Has anyone tried or succeeded in recovering the ArcGIS for Server (AGS) user name used in the connection? I need this because I'm doing some edits to a Enterprise GDB, SQL Server with the same user ...
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69 views

Python 2.6 Module for GDAL 1.9.2, ImportError

I work on an internal network(IE I cant get the latest 1.11 stuff) and have GDAL 1.9.2 setup on a Red Hat Linux Enterprise Server 6. My linux box has python 2.6.6 however the python binding I received ...
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101 views

Reprojecting and Clipping in one script using Python Subprocess module and GDAL

I am trying to reproject a .tif file then clip it to the boundaries of a shapefile using GDAL Warp. I want to do this in a single script, and have successfully used the Python subprocess module to ...
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116 views

How to freeze basemap using cx_freeze

I am working on script and I´d like to freeze it for use in computers who haven´t got python installed- The script is running fine but when I freeze it using cx_freeze an error appears. at the end ...
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97 views

Clip Management won't work outside of ArcMap/Catalog

Okay so I have a short script that works great when copied into the python window in ArcMap or ArcCatalog, but refuses to work in an IDE for whatever reason. The error that is thrown is: Start Time: ...
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24 views

Adding features in the layer with reference to another layer

I have built a tool for creating line in the exact center of two selected lines through this code: import math def mainCl(): ftr_geom = [] select = iface.activeLayer().selectedFeatures() ...
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54 views

Can I invoke MapWindow GIS software from python,.net or any other scripts language

I am interested in working with MapWindow GIS. Is it possible to invoke MapWindow GIS from scripting (like external python).
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49 views

Error writing defaultdict values to feature class rows

I originally posted building dictionary from feature class field values, how can I ensure there are no duplicate values per key. The goal is to update another field with all the values per key, which ...
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68 views

Python trainings comparison

My employer provides me with a generous annual training budget and I'd like to use it on one of the following two Python courses. As a GIScientist, I would like to attend the course which will give ...
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194 views

How to change color ramp in graduated classification with standard deviation using pyqgis

I'm using graduated clasiffication with standard deviation to style my shapefile (see code below). But I need to use different color ramp for classes below mean (-1std, -2std etc.).I'm thinking of ...
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28 views

Print Custom Feature Form using PyQGIS

I recently asked a question and accepted the answer, as it was a good guide on accessing the print composer using python. However, I am still looking for a way to print the custom feature form. Does ...
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1answer
225 views

How to create a shapefile or gml from a Oracle database using SDE.ST_Geometry?

I have a ORACLE database 10g(Oracle Database 10g Enterprise Edition Release 10.2.0.3.0) with a SDE.ST_Geometry field and i want to make a program in python so i can create several shapefiles based on ...
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102 views

midpoint of segments in QGIS determination

Gene thanks for your note on the problem yesterday ... This is a follow up to a question I posed before (How to find the middle point of a line in QGIS - Where to place input file name). Errors coming ...
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68 views

Is there a python function in QGIS to detect if the output file is saved to the hard disk?

I'm currently using QGIS 2.4 and writing some custom scripts on it. A proper script not only accomplishes its function, but also accepts user defined parameters and checks for possibilities of errors. ...
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102 views

QGIS Add WMS layer with python [duplicate]

I'm developing a stand alone python script using QGIS 2.2.0 libraries. I want to add a WMS base layer to my map, and I follow the instructions reported by the documentation: urlWithParams = ...
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136 views

User input and passing variables with ModelBuilder

I have created three modelbuilder tools that must be run in sequence. After running each tool, the user must examine several shapefiles and potentially change the input parameters of the next tool. ...
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81 views

Stereo-pair Image Registration

Is there a simple command line or python based way to visually register a pair of overlapping stereo images and clip the non-overlapping areas out? These images do not have spatial information ...
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65 views

PyQGIS: Properly trigger actionPan() tool when feature is added

I wrote a plugin which creates a custom map tool that adds features. I would like to cleanly connect to the pan tool after a feature is added. I've done it in the following way and it works, but I get ...
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116 views

Raster created by python GDAL interpreted upside down

I am using CRS which has axis in left bottom corner. Code below produce Geotiff which is shown allright in QGIS but when I open it in other software it is upside down. Also gdal_calc takes it as ...
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62 views

ArcGIS 10.2.1 working with time and reporting when feature geometry has changed

I'm working, with ArcGIS 10.2, ona whole lot of petroleum licencing data that chops and changes, in active areas, on a relatively frequent period. i collect the geometry data month by month (saving ...
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2answers
71 views

Creating a plugin tutorial

I am looking for a tutorial of how to create a plugin for QGIS. I want a tutorial that: Explains about the latest version of QGIS Working in windows environment. adequate for absolute beginners and ...
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278 views

Cumulative field calculation using Python in ArcGIS for Desktop?

I am using the following Python code to sum cumulatively but I need the summation to take place while the other field is equal to 1 and then again start the summation when it's equal to 2. I need the ...
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168 views

Finding areas with high POINT density from PostGIS table using Python

I have a PostGIS table with thousands of POINT objects and I want to find areas that have a high density of points. I have the DBSCAN clustering algorithm implemented in Python which does exactly ...
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126 views

QGIS processing framework SAGA NaturalNeighbor in external Python Script - No Output

I want to build a little script, which generates a NaturalNeighbor grid based on a point Shapefile. The script runs within my PyDev environment without any error messages, but no outputfile is ...
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43 views

Setting up ArcPad applet (Python) that calls arcgisscripting?

I've been asked to support a legacy script that was "made" (read: found) by a former coworker. My python skills are pretty basic, so I went right to installing the applet like I would for a VBS ...
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107 views

Populating Access (*.mdb) table with text from Text Elements to inventory MXDs using ArcPy/Python?

I am trying to write a piece of code to populate an Access mdb table with information from text elements in an mxd (text elements all have "names"). The purpose of this is to create a catalog of my ...
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33 views

Ungenerate command in ArcGIS for Desktop? [duplicate]

I am searching for the ungenerate command in argis10 desktop. I get to know that is available only for workstation. But i don't have workstation. Is there any way to use this command or any other way ...
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1answer
88 views

Programmatically access HTML Popup in Layer Properties ArcGIS 10.2

Is it possible to access HTML Popups (found in layer properties) programmatically in ArcGIS 10.2? I can't find any reference but thought I'd ask to double check.
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2answers
131 views

cadtool and spline plugins not working

Am trying to edit a line shapefile using a spline tool in QGIS 2.4.0 .Its drawing but the ok button is inactive. what could be the problem? Generally am trying to create a curved line.
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36 views

Python Script calling custom model failing during model execution

I have a python script that calls a model I built in model builder. If I run the model by itself it runs perfectly. If I call the model in the python script, the model errors in various locations. ...
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1answer
54 views

Load feature class with tab delimited file that is missing Lat/Long

I am working on a Python script that receives a nightly tab delimited flat file. This flat file has Latitude and Longitude fields and the script loads the data using the gp tools Make XY Event Layer ...
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155 views

Orthographic projection in Python Basemap

I'm trying to plot a GeoTIFF in Python using Basemap. I can do so correctly with cyl projection like this: m = Basemap(projection='cyl', llcrnrlat=LL[1], urcrnrlat=UR[1], ...
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494 views

Using GDAL to read dted files

How do I get the elevation at a certain point using gdal to read in a dted file? I don't see much useful information out on the web. I'm sorry I should have been more specific. How would I ...
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1answer
315 views

Error on FeatureClass To FeatureClass conversion arcpy

I am currently working on a python script where I am trying to copy selected features into a feature dataset. Basically I have an mxd containing some layers, and for each layer I select features by ...
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65 views

How to write in only a file .csv (or .txt) the values contained in several rasters?

I am an beginner in Python programming but I would like to write in only a file .csv (or .txt) the values contained in several rasters. For example, I built several rasters by using a loop. The ...