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

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1answer
34 views

OGR DeleteDataSource not working properly in Python

I have a small Python script which is supposed to delete a shapefile in case the file is empty. import sys from osgeo import ogr drv = ogr.GetDriverByName("ESRI Shapefile") ds = drv.Open(inData) if ...
2
votes
0answers
83 views

developer problem with PyQGIS

I am a QGIS developer. We have been modifying the source code of QGIS for several months and have done good work in QGIS version 2.1. After that we tried to do the same modifications for QGIS version ...
2
votes
0answers
249 views

Why does python reads only the no data value from GeoTiff file?

I had a number of tiff files with a country's map. They had different rows, columns or different projections etc. I needed to make them with same projection, spatial resolution and same number of rows ...
2
votes
1answer
53 views

Automating polygon mergers with python

This is the first real world python program am trying to write. I am trying to create a scrip that takes a shapefile that has n polygons with an integer formatted date (e.g. yyyymmdd or 6/24/2014 is ...
2
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0answers
51 views

how to make a list of features constructing the dissolved feature?

I need to simplify my road network using the dissolve function to remove nodes not occurring on the intersections. the following code is doing that. arcpy.Dissolve_management(self.address_cor_layer2, ...
2
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0answers
103 views

How to detect turns of a route?

I'm doing a Python simulation of a vehicle, driving along a specified path. I generate dummy GPS readings, that fetch the current position of the vehicle, with some randomized error added. After a ...
2
votes
1answer
162 views

Import error when utilizing QGIS's Python Init function

Based on the answer to Referencing Qt UIs external to plugin with python. I'm trying to utilize the "Layer Properties / Fields / Python Init function" to execute a file (test_file.py) that is located ...
2
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0answers
72 views

How to add nodes into graph

I'm new to qgis and in here I want to find a path between two selected points on the map(Roads-vector layer). The points are selected by the user, using mouse clicks. So here I used the astar ...
2
votes
1answer
120 views

How to change attributes with QGIS python?

I have this piece of code which I would like to use for inserting values into column. It does not throw an error, the changes are not written to the source (shapefile). from qgis.utils import iface ...
2
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0answers
625 views

Running x64 bit geoprocessing Python in Python IDLE 2.7.6 x64 error

I am trying to set the Python IDLE 2.7.6 x64 to run the arcpy module from ArcGIS x64 bit geoprocessing (10.2.2). I copied the file DTBGGP64.pth from C:\Python27\ArcGISx6410.2\Lib\site-packages to ...
2
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0answers
142 views

Convert a classification image to aggregated polygon in shapefile using gdal/python

My goal is convert a 2D numpy array to shapefile. The matrix results from a classification, so the numbers have a meaning. I solved my problem, but the solution is somehow involuted and complicated. ...
2
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0answers
107 views

Can't remove the little islands when creating a svg map with kartograph.py

I'm new to python and to kartograph. I'm using it to create a map of France, Italy, Portugal and Spain. But I don't want the little islands (mainly the French ones ), causing the generation of a big ...
2
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0answers
306 views

Split a Polygon that Crosses International Date Line, ArcPy [closed]

I have a lots of existing data in WGS-1984 (too much to manually edit). I need to split these lines and polygons by the international date line. More projection information: ...
2
votes
1answer
156 views

Accessing CRS info with pyqgis in a standalone application

I'm currently having trouble accessing and defining CRS information in a standalone application. I've read the API documentation and have tried it in the python console in QGIS 2.2.0. The python ...
2
votes
0answers
232 views

ArcGIS10.2 crash opening python window

I was trying to test the data management commends in python, yet arcgis crash every time I I try to open to python window. According this post, it is the python version issue. I do have other versions ...
2
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0answers
18 views

How to access annotation feature classes in ArcPy? [duplicate]

I want to batch replace paths in a series of .mxd files using Python. Many of the layers have moved and in some cases the name has changed or its dataset is different. I've written this code which ...
2
votes
0answers
171 views

Decompress a LZW-compressed GeoTIFF

I have a LZW-compressed GeoTIFF file and would like to split it into several smaller regional files and change the format to png. I tried to do the spliting with gdal_translate -srcwin. I only get a ...
2
votes
0answers
72 views

Compare line with next line in attribute table shapefile

I am making a python code for ArcGis 9.3. The aim is to compare the value of my field "ID_BV" at line l with value of field "ID_BV" at line l+ 1. And depending of the test answer i populate another ...
2
votes
2answers
384 views

Python problem visualization .tif image

I am trying to read a hyperspectral image in Uint16 .tif format and visualize it. I use GDAL in Python to read the data and everything works perfectly when I use matplotlib to show one band of the ...
2
votes
1answer
111 views

Conditional SQL Query

I've been running a code that searches a desired field in a feature class and performs an specified SQL query based on whether the field is string or double. The variables are just temporary fillers ...
2
votes
0answers
107 views

How to detect broken hyperlinks with arcpy?

I have zero experience with python but am trying to search for broken hyperlinks in a large gdb (temporarily converted to a shapefile)- Used code from a previous question (Hyperlink broken path - ...
2
votes
2answers
184 views

How to trim strings in Field Calculator?

I am currently working on a County plat book and am in the process of prepping the "Owner_Nm" field that will serve as my annotation layer. I am trying to whittle down the owner names, based on ...
2
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0answers
79 views

Identify different networks inside a line shapefile

I'm dealing with a quite big line shapefile containing road tracks. The roads are connected to each other, creating distinct networks. These networks are independent and they are not connected to each ...
2
votes
0answers
265 views

Publishing ArcGIS geoprocessing service - upload custom python modules? [closed]

I have an ArcGIS geoprocessing service which causes problems when publishing to arcgis server. The python scripts behind the service are structured as a custom python module, in a folder with an ...
2
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0answers
74 views

QGIS: rotatable markers with offset from point

Im wondering, if its possible (in QGIS), to set a rotatable marker with offset from point, like in my example below. Any suggestion?
2
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0answers
140 views

How can i add a north arrow in QgsComposition?

I'm trying to add an svg image of north arrow in QgsComposition using this code: mapRenderer = iface.mapCanvas().mapRenderer() theComposition = QgsComposition(mapRenderer) ...
2
votes
1answer
205 views

QGIS Python Labelling [closed]

i want to label a point layer with those values exceeding a set of variables attribute table as follows 'loc field'(text),'a'(float),'b'(float),'c'(float) variables as follows vara = 5, varb = 3, ...
2
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0answers
123 views

How to display images as cross sections in 3d

I want to display a base map and several vertical cross sections in 3D. The base map image is easy to rectify as a geotiff. How can I also display the cross sections? The cross sections are at ...
2
votes
0answers
57 views

Using the geocode function with cursors

How do I use a cursor with a geocodeaddress function? I want to be able to: 1) read from a table 2) only geocode addresses(from table1) whose street number is not 0 using a cursor 3) then update a ...
2
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0answers
1k 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 ...
2
votes
0answers
234 views

Zonal Statistics using Gdal and Python

I recently came across a loop_zonal_stats function by @ustroetz found here: Issue Trying to create Zonal Statistics using Gdal and Python.. I am using a (single) polygon shapefile and a raster file to ...
2
votes
0answers
45 views

How to Complete ModelBuilder Process Quicker?

I've built a script tool in ArcGIS's ModelBuilder to collect parameters from the user and use them as arguments for another python script. The output of this script is a text file. The only GIS ...
2
votes
0answers
104 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 <- ...
2
votes
0answers
49 views

Extract MultiValuesToPoints yields identical value for each band

I'm attempting to extract hyperspectral remote sensing data to a point featureclass using the ExtractMultiValuesToPoints ArcGIS tool. The value of each band (228 bands) should be appended as a field ...
2
votes
0answers
282 views

What causes Scripting Error 000714 in ArcGIS when using GetParametersAsText? [closed]

I am trying to create a script tool in ArcGIS 10.2 in order to incorporate into a model. The script needs to incorporate three inputs which i've built using GetParameterAsText function then setting up ...
2
votes
0answers
84 views

Distribute QGis plugin which depends on certain Python packages

I developed a plugin for Qgis which depends on some Python packages. On Linux and Mac, this is not really a problem because I can easily install them with the system pip command. Windows is another ...
2
votes
1answer
223 views

How to use SAGA ShapesToGrid via Processing in a Python plugin?

I run these lines in my code: vectorlayer_vector = ftools_utils.getVectorLayerByName(inputLayer) Elevation = self.lineAttrib.currentText() cellSize = int(self.linePix.value()) outPath = ...
2
votes
0answers
477 views

How To Export Selected Data Driven Pages to PDF?

I have a map book with data driven pages that shows the fire boundaries, roads, etc for our fire rescue department. I want to automate the process of creating individual mini map books for each fire ...
2
votes
0answers
448 views

Is there a way to execute FME transformers from a PythonCaller script in an FME workspace?

I have a very large and complex Python/arcpy script that does lots of custom calculations, and I am trying to port it to an FME environemnt. The script runs beautifully under ArcGIS. The problem in ...
2
votes
0answers
225 views

How can I create random concave polygons for test purposes?

In the context of generating random test data using QGIS (in a shapefile): I can generate random, continuous (adjacent) polygons by first creating n random points using ftools and then generating a ...
2
votes
0answers
338 views

Finding coordinates from a nested grid as a numpy array

So this is a pretty basic question, but I'm trying to figure it out. I've written a script that allows a user to read in a raster and provide a cell resolution, and outputs the amount of cells ...
2
votes
0answers
191 views

python.multiprocessing and “FATAL ERROR (INFADI) MISSING DIRECTORY”

I have a question which is closely related to this old question here: python.multiprocessing and "FATAL ERROR (INFADI) MISSING DIRECTORY" I have also looked at this, which seems to relate ...
2
votes
0answers
122 views

Python scaling issues and possible subprocess conflicts?

I have always found such great analytical and programming expertise on StackExchange in the past that I hope you can help me. Background: I have a project that involves spatially joining and ...
2
votes
0answers
36 views

ArcPy: Distortion towards edges when exporting to TIFF [duplicate]

I am writing a function to zoom to selection (based on a criteria) and Exporting it to TIFF. The problem I am getting is that the when I load the exported TIFF image in Map, I am seeing distortion ...
2
votes
0answers
45 views

Building Arc add-ins without needing to restart Arc [duplicate]

One of the things that annoys me the most with trying to use the Arc add-in wizard is that I need to restart Arc every time I want to test something. This is especially annoying if I've got syntax ...
2
votes
0answers
177 views

Python Script within ArcMap running GME Command passes a double forward slash when writing the log file

I thought I made some serious headway there today. My script works perfectly fine when run from a Python Shell, but in ArcMap, whether the script is run from the Python Command line, or within a ...
2
votes
0answers
77 views

Convert absolute file path to raster databaset [closed]

I wrote a simple python script that outputs an absolute path as string to a GeoTiff file. So this file can be treated as Raster. In a Model, the GeoTiff file is to be the input raster of a CopyRaster ...
2
votes
1answer
197 views

Is it possible to run a search cursor on a multipart feature class?

I have a multipart feature class of cities. I want to run a search cursor on a cities feature class where: one city is selected and a select layer by location is run to select all parcels that are ...
2
votes
1answer
329 views

KML to shape QGIS conversion [duplicate]

I am trying to import a KML file to QGIS. The KML source file is about 15mb is comprised of polygons with attribute data. The KML imports fine and polygons display but the attribute data is unreadable ...
2
votes
1answer
881 views

How to create a QGIS Action which loads a raster?

I am following an article here:Actions HowTo , specifically the piece about an action to load a raster: Python type Add Raster Layer ...