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

learn more… | top users | synonyms

1
vote
0answers
41 views

I can't get fiona to write while copying shapefile

I am trying to debug a function and have narrowed down the issue to a problem with my attempt to use fiona write. After going through the many online resources, I can't seem to find my problem, ...
1
vote
0answers
21 views

How to update the items of qCombox in custom form?

For my project I use a custom form with multiple value relation comboboxes. This works quite fine and I can access the widgets via my script. Init the two comboboxes which are correctly filled ...
1
vote
0answers
27 views

Python problem during CADInput installation

I was trying to install CADInput (version 0.60) on 2.4 Chugiak and 2.6 Brighton as well. In both cases I got an eror message during installation. For me the following extract of that message might ...
1
vote
0answers
91 views

Has anyone been able to programmatically generate and post web map definitions to ArcGIS Online and create web maps?

I'm using Python to build an ArcGIS Online web map definition JSON string, and then trying to post the configuration to ArcGIS Online to create a web map. I am using an admin account to generate the ...
1
vote
0answers
105 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 ...
1
vote
0answers
139 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 ...
1
vote
0answers
66 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 ...
1
vote
0answers
39 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 ...
1
vote
0answers
61 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 ...
1
vote
0answers
29 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 / ...
1
vote
0answers
262 views

py2exe ImportError: No module named _err

The .exe file generated with py2exe returns the following error: c:\Users\...\dist>ShapeFileConverter.exe Traceback (most recent call last): File "ShapeFileConverter.py", line 4, in ...
1
vote
0answers
156 views

How to convert length in Decimal degrees to meters programmatically?

I'm new to qgis and I want to find the length of some roads in a map. So I used the following code, from shapely.wkb import loads def getLength(): layer = ...
1
vote
0answers
87 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 ...
1
vote
0answers
65 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 ...
1
vote
0answers
24 views

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

have some one try or succed in recover the ArcGIS for Server (AGS) User name used in the connection, i need this cause i'm doing some edits to a Enterprise GDB, SQL Server with the same user and ...
1
vote
0answers
38 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 ...
1
vote
0answers
60 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 ...
1
vote
0answers
65 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 ...
1
vote
0answers
66 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: ...
1
vote
0answers
23 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() ...
1
vote
0answers
87 views

Esri Python Toolbox(pyt) corruption in ArcToolbox.dat

Symptoms: Open ArcCatalog and all tools within Python Toolbox(pyt) have a red-x error next to them claiming that "Arcpy module has no attribute Parameter" Close ArcCatalog Delete ArcToolbox.dat file ...
1
vote
0answers
40 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).
1
vote
0answers
43 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 ...
1
vote
0answers
64 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 ...
1
vote
0answers
121 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 ...
1
vote
0answers
24 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 ...
1
vote
0answers
65 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 ...
1
vote
0answers
63 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. ...
1
vote
0answers
76 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. ...
1
vote
0answers
54 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 ...
1
vote
0answers
45 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 ...
1
vote
0answers
192 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 ...
1
vote
0answers
99 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 ...
1
vote
0answers
87 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 ...
1
vote
0answers
37 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 ...
1
vote
0answers
29 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. ...
1
vote
0answers
96 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], ...
1
vote
0answers
52 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 ...
1
vote
0answers
43 views

GeoDjango WebMapping Application Update

According to the below GIS.SE questions, GeoDjango was the preferred framework for creating simple and quick webmap applications. But these questions are now all 2-3 years old. Can we verify whether ...
1
vote
0answers
53 views

How to load style from postgresql?

Is there any way to load a postgresql style for a vector layer using python? There is a function: loadNamedStyleFromDb (const QString &db, const QString &theURI, QString &qml).Does it ...
1
vote
0answers
26 views

Problem Loading Plug-Ins in QGIS 2.2 on Mac

I'm trying to load the 'processing' module in QGIS (2.2.0-Valmiera on Mac OSX 10.8). However, this module and others (e.g. GarminaCustomMap) re failing to load with a message: ImportError: No ...
1
vote
0answers
53 views

Mapping from one plane on the other plane despite of masking regions

have a set of data given here, where in the first and second columns there are the sky coordinates (ra,dec) e.g. right ascension and declination, respectively and in the third and forth, the ...
1
vote
0answers
66 views

Creating symbology by category in python?

I'm trying to create a python script that creates color-coded symbology by county for multiple maps with different data. I've never created a layer file for the purposes of symbology before, but I ...
1
vote
0answers
44 views

Clipping between features within a single vector?

Is it possible (via the Qgis API and friends), to clip polygonal features within a single vector layer? The hope is to accomplish this without having to duplicate the feature into a new layer. ...
1
vote
0answers
51 views

Scaling features based on an attribute

I would like to scale polygon features by a specific factor I have calculated for each feature in a feature class. I know of the Scale tool, however it only allows for manual entry of a scale factor ...
1
vote
0answers
158 views

QGIS plugins - how to use a custom behaviour on right click and actionPan on left click?

I have been struggling with this problem for quite a long time. Here we go : I implemented a maptool that draws a red cross on the point that is being right-clicked on. There are good how-tos, such ...
1
vote
0answers
108 views

pyQGIS 2.0: Sending signal when identify button is pressed via gui

I have a question regarding the qgis identify tool for version 2.0. I would like to know if it's possible to send a signal when the actionIdentify is triggered by the user via the gui. I'm trying to ...
1
vote
0answers
14 views

Proper updating of new memory layer geometry?

Current workflow for a toolbar button: -create memory layer -save memory layer to shapefile Then the user uses the built-in QGIS tools to add geometry and finally saves changes via the auto prompt ...
1
vote
0answers
68 views

QGIS2.4.0: Cannot import qgis module in python “from qgis._core import * \n DLL Load Error”

Having some trouble importing qgis into python. I'm very new to python so it could be a simple mistake. The path seems to be correct. It gets this far: File "<stdin>", line 1, in ...
1
vote
0answers
61 views

Vector layers without geometry in QGIS?

Using QGIS, I have set up a couple of automated layer additions via the toolbar. After adding geometry in each respective layer (point, lineString, polygon) and saving changes to the layers, the added ...