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

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How can i import shapefile in python?

from PyQt4.QtCore import QSettings, QTranslator, qVersion, QCoreApplication from PyQt4.QtGui import QAction, QIcon, QFileDialog Initialize Qt resources from file resources.py import resources_rc ...
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3answers
2k views

Python: How to create a Polygon Shapefile from a list of X,Y coordinates?

I have a list of X,Y coordinates from a csv file, that represent a polygon. I´m trying to create a Polygon-Shapefile from this list. I´ve been trying around and found a possbility to write the list to ...
3
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29 views

PyQgis: How to access a deleted features attributes (before committing)

I have a signal setup for a feature deletion event on a layer: self.layer.featureDeleted.connect(self.feature_deleted) When I try and grab an attribute from the deleted feature on the slot, a ...
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1answer
35 views

GDAL Python and postgis raster?

I'd like to create a postgis raster using GDAL and python. I can get the driver easily: drv = gdal.GetDriverByName("PostGISRaster") But how can I create a new raster table? I can't find any ...
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1answer
19 views

TypeError: unsupported operand type(s) for *: 'float' and 'geoprocessing Layer object'

I am getting a rather unclear type error, and after searching online I cannot find any solutions that help. I am trying to create my own python toolbox for wifi router signal loss, and I am trying to ...
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1answer
33 views

How to find if map layer registry is empty?

In my script I want to open layer named my_layer if it is in the map layer registry. I use following code for it: inputLayer = QgsMapLayerRegistry.instance().mapLayersByName("my_layer")[0] If not ...
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31 views

Problems using da.UpdateCursor in python Add_in to Edit Feature Class

I am currently attempting to create a Python Add_in tool which will perform a set of geoprocessing operations resulting in new values for a specific !shape.area!acres calculation on a new layer and ...
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1answer
40 views

Polygons in one layer have different attributes

Is it possible in PyQGIS to have in one layer more polygons and some would have one set of attributes and another different? E.g. Polygon_1(name, size, average_age), Polygon_2(name, size, ...
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1answer
354 views

How to begin with tool development for GRASS gis or QGIS GRASS

I wanted to begin with customized tool development in Grass GIS or QGIS grass. How should i begin in to develop the tool. I search a lot in google search engine for begin with tool development in ...
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10answers
8k views

How do I develop my GIS programming skills?

I would like to develop my GIS programming skills, where do I start? People say learn C++ or Python but where can I learn this in a geographic context? Tutorials or anything would be very helpful, as ...
2
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1answer
620 views

Converting Tab to Shp Using OGR2OGR with Python on linux

First i downloaded http://svn.osgeo.org/gdal/trunk/gdal/swig/python/samples/ogr2ogr.py and i am importing this. How can i get ogr2ogr to run in my script? nothing seems to be working and i not sure ...
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588 views

How to create a label formatted like “ 1,000' ” from a numeric field?

This question builds on a previous question I came across at gis.stackexchange: How to easily edit attribute data using Regular Expressions? Perhaps someone can point me in the right direction? I ...
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0answers
14 views

how to make rectangle selection by mouse on my map(world shape file) in qgis in python

I want to make a rectangle selection using the mouse on my map (world shape file) in qgis in python and extract the lat lon of the selection area but I don't understand how to do it. I don't have any ...
3
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0answers
19 views

How to run a tool from Whitebox GAT in ArcGIS?

I have a series of tools that I need to run in ArcGIS to hydrologically condition my DEM, but the first step in this process is running the Breach Depressions tool from Whitebox GAT (I have found that ...
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1answer
25 views

How can I check in QGIS python if an atrribute is included in my layer?

I use the following code: for field in self.layer.pendingFields(): if field.name()=='elevation': do this else: do that Although there is an elevation attribute in my layer ...
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2answers
3k views

How to access attribute data type in QGIS?

I've been developing a plugin on QGIS platform using PyQGIS. So far plugin does the following: You can select any feature of the already loaded vector layer in QGIS. After selection, plugin displays ...
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46 views

Why would this script only load 14 out of ~13,000 feature classes to the topology?

The following script adds ~13,000 feature classes in a gdb into an existing topology. If I want to add rules to said topology, would I write a second script or include it within this script below? ...
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3answers
3k views

Python: Combine multiple Shapefiles

i have got a lot of Point-Shapefiles (r20010101.shp, r20010202.shp, r20020101.shp...). Each of them has the same amount of points at exactly the same location. In a column that is named after the Date ...
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24 views

How to sort points in a proper order using arcpy? [duplicate]

As the picture shown in below that i have bunch of points distributed in an area. The problem is that their attribute records of each points is not in a proper order as u can see in the left bottom ...
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2answers
186 views

Connecting to Oracle database on a network in python

There is lots of information out there on how to do this, unfortunately, it all looks like Greek to me. I need a connection to a DB so I can add and use tables and featureclasses contained within ...
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1answer
15 views

How to read non-spatial data using PyQgis?

I'm generating maps with QGis. What I do is generate a bunch of non-spatial data on a set of cities (using VBA), and still using VBA, generate a python code that will automaticaly output general map ...
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21 views

How to accelerate my python looping process for A-star path finding on DEM surface?

I try to make an A-star Path Finding program base on tile-graph (image raster data as graph) where each pixel values represent as cost and elevation.. In my case, DEM raster data was called by using ...
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1answer
76 views

Is it possible to import/run AML script into GRASS?

I have an AML script that has instructions to import tmp files of (grid, network, basin...) is there any way to run the script in GRASS? I tried to converted to Python but I couldn't do it for the ...
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1answer
692 views

How to run an AML in Python?

I am trying to run an AML in a python program I am writing and haven't been having much luck figuring out the correct way to run the AML. The AML requires ArcInfo Workstation to be from the GRID ...
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2answers
186 views

AML routines and python

I´m trying to use some AML files in ArcMap 10, but I have noticed that this option is not available for this version. Does anyone know or tried to "translate" the aml sequences to another language ...
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28 views

How to Access tables and feature classes stored in Dropbox using Python

I stored some tables and shapefiles in by academic Dropbox account. I am trying to write the code block that will set the directory path to the featureclasses in Dropbox to a variable that can be ...
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0answers
9 views

Can't get the web OpenLayers plugins to work because of 'python error' on my mac

I'm trying to get a relatively small section of Google satellite/ Google earth as a layer on Qgis on my mac. When I go to 'web' and the 'open layers' plugin it just comes up with python error. I've ...
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2answers
46 views

Accessing Point Cloud Data [on hold]

I have a point cloud dataset, and I am trying to divide it up into sections of point cloud data (in a grid-like manner). Essentially, I will have little cubes of point cloud data, possibly by given ...
2
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1answer
22 views

How to create a new empty memory layer with fields scheme from other layer in QGIS?

Being a complete noob with python so far, I got inspired by this answer: http://gis.stackexchange.com/a/155988/8202 to dive into it a bit. When creating features in a new target layer from an ...
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0answers
27 views

Ways to reduce buffer if it passes through a certain layer

I am trying to do WiFi analysis on signal strength in ArcGIS Desktop, and one of the big problems that I am running into is how to reduce the signal when it comes in contact with a wall, as it does in ...
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15 views

How can I connect MYSQL database in python for QGIS desktop Application?

I am following below process. 1 - Setting You must install a MySQL driver before doing anything. Unlike PHP, only the SQLite driver is installed by default with Python. The most used package to do ...
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11answers
34k views

How to install GDAL with Python on windows?

Can anyone please explain to me in step by step instructions how to install GDAL/OGR with Python on Windows. I have Windows Vista and I have tried following the information on the website and it does ...
4
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1answer
55 views

Difference in destination location between pyproj and geopy

I am looking at ways to calculate (in Python) the destination location from a point given bearing and range. Based on the results comparison from the 2 libraries in subject(geopy and pyproj), I ...
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0answers
22 views

Installing GDAL Python bindings on Windows [duplicate]

This has been addressed before (How to install GDAL with Python on windows?), but I wanted to bring the question up again, to see if anybody has come up with a better method in the last 5 years, and ...
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0answers
25 views

How to build a raster populated with an equation in a python toolbox?

I am working on creating a python toolbox to solve for WiFi signal properties based on various inputs, and for the end result I would like to have the output in the form of a raster. I need this ...
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1answer
457 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 ...
5
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2answers
766 views

Python Script to convert a mass of KMLs to a single fGDB

I have a mass of KML files, approx 350+ that I need in a single fGDB. I lifted a string of code from ESRI help to attempt to do this - I got it working to the point of creating all the individual ...
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1answer
31 views

Convert multi KML and KMZ into shapefile using ArcPy?

I try to convert with arcpy (python 2.7.8) 50 KML and KMZ files, that i downloaded from google earth into shapefiles. All files located in many sub-Folders. All Sub Folders are located in one large ...
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0answers
49 views

Python version issue

I am using arcgis 10.1 and running this script on python version 2.7.2. # Import standard library modules import arcpy, os, sys from arcpy import env # Allow for file overwrite ...
2
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0answers
47 views

Gdal Python Problem : Black strips in geotiff

I am trying to use GDAL (2.0.0) Python API in Blender, but I am having some difficulties. I am trying to save geotiffs for : - a 2D numpy array storing 32bits floats - a 3 channels rgb numpy array ...
11
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2answers
4k views

How to read Excel sheet in ArcPy script?

I'm writing a python code to convert X,Y points in excel to shapefile. In this process i have toread xy points from shhet1. What is the step i have to include in my process to read data from sheet1 of ...
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1answer
247 views

Cause of ArcGIS Raster Calculator Parsing error <type 'exceptions.SyntaxError'>: invalid syntax?

This is my first attempt at much code in the raster calculator of ArcMap 10.0, but I think I'm close. I have nine rasters (A-I below) and want a new raster with value = 1 where any of the rasters ...
0
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1answer
21 views

Using ST_LINE_INTERPOLATE_POINT in OGR and python

I'm interested in finding the midpoint on a linestring using OGR and python. This can be a line with more segments. Could I use the ST_LINE_INTERPOLATE_POINT in python using the ExecuteSQL() method? ...
5
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3answers
321 views

Replacement for ArcScripts

Does an equivalent of ArcScripts exist? I know of the the ArcGIS resource center and "Code Galleries" but does something that equates to ArcScripts where users share useful ArcGIS code exist? The new ...
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0answers
32 views

Cul-de-sac (curve) turns generation in flow for parallel lines using ArcGIS for Desktop?

I'm using ArcMap 10.2 and I need to generate a parallel lines within the polygon and connect them one to other with the curve, with the proper radius and return radius (the same as cul-de-sac tool ...
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32 views

Using ModelBuilder or Python parser of Field Calculator to check values between two datasets?

I have a *.dbf that I need to check values against for a shapefile. I need to report whether the values match the dbf in the shapefile and, if not, what the value should have been (in two new ...
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1answer
149 views

How to print 2 maps in the same PDF page using PyQGIS?

I am trying to generate a one-page PDF document containing the following items: 1) On the left half, a full state map (say, New York State). 2) On the top right quadrant, a map that zooms in to one ...
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1answer
50 views

QStringList() error in plugin of QGIS 2.10

I have made a Dialog in PyQt for use it like a plugin under QGIS 2.10 The Dialog works fine like a standalone application, but if I try to call it like a QGIS plugin, I get this error: ...
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0answers
33 views

ZeroDivisionError

I was conducting Mean Coodinates process functions with weighted fields when I began faces ZeroDivision errors in some processes. The Shapefile Data has been joined together with imported Spreadsheet ...
4
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2answers
44 views

how to create geo-referenced random data?

I'm writing a dissertation on different parameter settings in GWR . In order to perform tests I'd need the availability of geo-referenced data that show some sort of spiatial correlation (i.e. values ...