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

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pyQGIS - Data Source is Invalid

Why I am getting Data Source is Invalid in python console of QGIS when running: vlayer = QgsVectorLayer("home/sanjayr/Desktop/india-latest.shp/buildings.shp","sanjay","ogr") I am using QGIS 2.4 on ...
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49 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. ...
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39 views

FWTools Python ImportError: DLL load failed:parameter is incorrect [duplicate]

Please, can anyone help me solve this issue? Please find the attached snapshot for your reference. I am working on a Windows 7 Professional, Service Pack 1, 32-bit laptop.
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1answer
372 views

Copy Parallel editor tool - python script / modelbuilder [duplicate]

Is it possible to use Copy Parallel tool in a python script or in modelbuilder for ArcGIS 10.2? Does anyone have a workaround or script for a tool that essential does the same thing as Copy Parallel. ...
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331 views

Cause of Field Calculator UnicodeEncodeError: 'ascii' codec can't encode character u'\xf6' in position 5: ordinal not in range(128)? [closed]

def Befahrung(value1,value2): if value1 is ' ': return ' ' else: return "G:\\Example\\" + str(value1) + "\\File_" + str(value2) + ".pdf" I try to create a field with a hyperlink. It works ...
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59 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 ...
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1answer
30 views

Python version of MAP_2POINTS

I think I may have stumbled onto an IDL function which does not have a python equivalent... :'( I am working with a Whiskbroom imaging radiometer (Terra/Aqua MODIS), with a corresponding bounding box ...
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266 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 ...
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180 views

How to add new columns with attributes in existing Qgis layer?

How to add new columns with attributes in existing Qgis layer? Doing the "same thing" here described
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1answer
84 views

What is a simple python code to practice with in arcgis? [closed]

I am trying to familiarize myself with python code. Could someone give me a simple code with an explanation of what it does so I can practice? Or a few codes with explanations if you have the time
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18 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 ...
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107 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 ...
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83 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 ...
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1answer
161 views

PyQgis Message Bar Woes [closed]

Having a bit of trouble with the basics of getting the (awesomely discreet) new user prompt/warning to properly display. Here is the (troubled) code I am using: self.iface ... ...
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1answer
244 views

How I get dbflib module for python27

I'm trying to use a script by python to download MODIS imagery. I follow this script: http://pyevolve.sourceforge.net/wordpress/wp-content/uploads/2009/02/modis.py. I installed: ...
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33 views

Vector Layer Symbol (ism) properties?

I would like to streamline the render of a polygon grid vector layer as a simple line (no fill) via Python coding. I am I bit confused by the implementation referenced by the API. Is it possible to ...
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79 views

how to call the method of DescribeFeatureType in owslib

I want to execute DescribeFeatureType operation of wfs services. However, I can’t find the method to fulfill this operation in the owslib. Can anyone kind enough to tell me how to do this. The ...
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145 views

How to make crs transformation of a QgsVectorLayer?

I need to transform QgsVectorLayers in python from one crs into another crs. By googling I found the following solution ...
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57 views

How to programmatically interrupt QGIS initialization and startup

I'm wondering how to interrupt the initialization of QGIS 2.0 on Windows XP before start up. I've put a dialog in one of my plugins that shows up on start up. However, I'd like to make a quit button ...
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1answer
144 views

Replacing text string on layout text element by reading lookup value from table via SearchCursor?

I'm not sure what the best way is to go about this, but here's my situation: In short, I exported a domain to a table (and I exported the table as a CSV, too, just in case it might be easier to work ...
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1answer
166 views

geotiff conversion to coordinate system with gdal

I would like to get the coordinates X Y Z from a geotiff file. I am using the gdal translate for the conversion. Which output format is the more adequate for containing a 3 numpay array X Y Z ?
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1answer
70 views

PyQGIS: feature added signal throws an error message

For my PyQGIS plugin 2.2, I try to: def logFeatureAdded(self,layerId,addfeatures): message = str(layerId) + " has features added: " for feature in addedFeatures: message += str( ...
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366 views

Python comtypes and ArcObjects: Snippets GetApp() fails at 10.2

I have been experimenting with Python's comtypes module to access ArcObjects. We are still using ArcGIS 10.0 as we are in the process of upgrading our ArcGIS for Server to version 10.2.2. I am ...
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1answer
122 views

Iso Cluster tool in script failing to open clip raster

I have been coding in Python for only a few months, so maybe I'm just overlooking a minor detail as a newbie. I have written the script below for a class project. It is supposed to clip two rasters, ...
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177 views

Pyqgis 2.2 : How to allow editing on layer and features [closed]

I'm writing a pyqgis plugin with qgis 2.2 I succeeded in accessing and displaying vector data (geometries & attributes). Now I would like to allow editing for all my layers and all features ...
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46 views

How to go about creating a custom tool/adding special functionality for a web app

In my soon to be developed web app, I will have an image service and also a feature service that is essentially an index to the image service, with all kinds of attributes. I would like for the user ...
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145 views

PyQGIS: Editable Combobox for Value Map widget isses

I am having issues with an editable combo box in QGIS 2.4. The edit widget is set to Value Map with an uploaded CSV. However, if a new values (not included in the key value pair list) is added, the ...
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179 views

Import QGIS Python modules in Python command line or standalone script

I am running a Windows 7 machine with Python version 2.7.8 (32 bit). I installed QGIS 2.4 (Chugiak) from OSGeo4W and simply want to be able to import the QGIS Python modules (e.g. qgis.core) into ...
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39 views

Link to pdf file through mouse clicking

I need help in identifying the feature attributes displaying a pdf file when click in that feature. I see many examples but I don't have success. I try this code: command = "firefox"; imagerelpath = ...
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120 views

Using python libary simplejson and urllib in PostGIS

I installed PostGreSQL9.3 and want to create a Pl/Python function using simplejson library and urllib. First I use OSGeo4W Shell to test the similar python script, it works. Then in PostgreSQL, it ...
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110 views

How to write a custom map canvas item by subclassing QObject and QgsMapCanvasItem?

I'm writing a QGIS python plugin where I place some QgsVertexMarkers on the canvas like this: marker = QgsVertexMarker(self.canvas) marker.setCenter(QgsPoint(point[0],point[1])) Now i would like ...
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432 views

Using OGR Intersection Method Python

I'm currently working to find the intersections between linears in a shapefile. I'm a newbie to the GDAL/OGR library. I've done some googling and came up with what seems to be a useful example(see ...
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121 views

Python code to determine the position on a map using Geo-Tagging

What is a proper python code, which enables to scan photographs (when captured from a series of snapshots) and match it with a geo-tagged image database. Based on the extent of similarities existing ...
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73 views

Doesn’t cal AGSSOM program to manage AGS mapservices from python script

We are using ArcGISServer 10.0 on a windows server. Because of database management we need to stop several ArcGISServer Services. For this purpose I use the AGSSOM program, which is called from the ...
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2answers
280 views

How to plot Storm Prediction Center (SPC) Shapefile using python

I am trying to make a plot of the SPC's thunderstorm outlook using Python. I have downloaded the shapefile from this website http://www.spc.noaa.gov/products/outlook/day1otlk.html. Then I use this ...
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37 views

GRASS r.out.mat memory issues

we have built a model with pythn/GRASS that calls the r.out.mat module. The area is quite large 25,000x25,000 cells. The machine we are running it on is Windows 7 machine with 16GB of RAM. After a ...
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167 views

pyQGIS (Spatial Join): Sum features of attribute from point layer and join with vector layer

I am new to Python and QGIS. I have avoided asking questions up to now. But by now I have developed a reasonable idea of where i want to go so and where I am stuck. So, I have decided to ask but sorry ...
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1answer
132 views

gdal_proximity distance to meters

I followed the answer given in this topic for searching the distance to the nearest coastline given a lat/lon coordinate. The distance output obtained is in degree (I think) but I need the distance ...
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1answer
58 views

how to separate a list of features from its shapefile_

I tried to copy all features in a list of dictionaries. the code looks as follows: def iterate_features(self): feature_set = arcpy.SearchCursor(self.address) for feature in feature_set: ...
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113 views

Python error message after download (QGIS 1.8.0/ Windows 7)

Hello to all members of the forum, I downloaded from the OSM website a small area in the neighborhood of Strasbourg, France: X (longitude): 7.6808 7.8216 Y (latitude): 48.5075 48.52 I got the two ...
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1answer
91 views

Resampling with Python console (QGIS): number of parameters

I am trying to resample two raster layers with Python console in QGIS with this code: outputs_0=Processing.runAlgorithm("saga:resampling", ...
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136 views

How to keep all the unique columns of the shapefiles after merge?

Writing a script where the user is asked to select a directory which contains Folder_1 and Folder_2, both containing shapefiles and run various algorithms. The basic logical process of the script is: ...
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110 views

Generating Custom Map image using Python with small installation footprint? [duplicate]

As a part of reporting requirements there is a need to generate region maps. These highlight various regions (countries or states/provinces) with different colors (or shades of a color) depending on ...
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42 views

ExtractByMask with one mask and multiple layers ArcMap

I have a multiple cost distance rasters and multiple feature layers. I need to find and join the feature layers (or associated shapefiles) that lie within a threshold of costs on the cost rasters. For ...
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1k views

How do I install PyProj module for Python 2.7 on Windows 7?

I am having trouble installing the pyproj module for Python 2.7 on Windows 7. I have tried both the 32 and 64 bit installers from this list but the install crashes each time I run it. I have the ...
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177 views

Using qgis modules in standalone application with PySide?

I want to make small standalone application using PySide and QGIS python modules to display satellite images and do standard GIS operations, like creating new shape file and placing polygons or points ...
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95 views

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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71 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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923 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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149 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 ╬╪╚┴╩└: ...