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

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Download offline satelite to be used for python app [on hold]

I need to download a high resolution map close as i can get that is publicly available as a satellite image to be used offline from the internet about to be used in my python app, this is roughly 100 ...
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1answer
107 views

Weighted Overlay - passing parameter as text error?

For some reason when hardcoding the save path for the wieghted raster just before runtime it works perfectly. Like such... arcpy.env.cellSize = "90" arcpy.env.workspace = r'G:\Xcel\Route ...
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1answer
55 views

What is the purpose of some functions and files in QGIS Python plugins?

I'm just trying to understand the architecture of a QGIS Plugin created with the QGIS Plugin Builder, as well as the workflow and the linkage among generated files. If possible, I'd prefer a diagram. ...
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31 views

python code doesn't preserve original range of values from my raster colormap template

I'm working towards an animation or movie of some distributed model output so I need to use a batch process for several hundred rasters that applies a consistent colormap and value range, however the ...
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2answers
31 views

Error 000358 or Error 999999 invalid SQL

i've been searching arround all the answers in the questions of Error 358 and beyond, but i doesn't fix my problems, i tried every post and so on the problems stills there. I make two options in my ...
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1answer
220 views

How to change the color of a selected feature with pyQGIS?

is it possible to change the color of a selected feature in qgis 1.8? To highlight a feature I use: vlayer.setSelectedFeatures(selectedList) box = vlayer.boundingBoxOfSelected() ...
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1answer
234 views

Polygon Neighbors Analysis script (ArcPy 10.1) producing erroneous results?

I'm struggling with a python script that is supposed to calculate a field for a polygon feature class. The calculation is of the average of a field value (P_TOT_DEV) for each of a given polygon's ...
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1answer
31 views

errors after installing 64 bit background geoprocessing on ArcGIS desktop 10.2.2

I installed 64 bit background geoprocessing on my ArcGIS 10.2.2 and then changed my pythonpath to "C:\Python27\ArcGISx6410.2" so that my code can benefit from the 64bit. then I had to install a 64b ...
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1answer
162 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 ...
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1answer
145 views

How to export a set of layers into multiple PDF(orAI)files, one layer at a time?

I am completely NEW to PYTHON(only took a 3-hr entry course in ESRI tutorial. I have a dataset contains files named as "1_A, 1_B, 1_C....12_A,12_B, 12_c,....200_A, 200_B, 200_C..etc." I need to export ...
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3answers
138 views

Why script works on my computer but not on another?

The script below works perfectly fine in my computer. But when running the script on another computer, I receive an error: Error: Algorithm not found The computer has similar specifications to ...
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3answers
65 views

Batch Re-projection script syntax error

import arcpy sourceWorkspace = "C:\\Users\\tx8p90\\Desktop\\Lesson2" targetProjection = "C:\\Users\\tx8p90\\Desktop\\python excercise data\\Lesson1\\contourlines.shp" listDataSet = ...
2
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1answer
321 views

Help with scripts for processing raster files with the raster calculator in QGIS

I am trying to process some raster files using python scripts in Qgis 2.20, and I have been having trouble finding any documentation on using raster calculator in scripts being run in the processing ...
2
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1answer
1k views

How to evaluate raster calculator expressions from the console?

How can I execute from the console an expression that should be used with the raster calculator? I'm searching for something like this: qgis.someRasterCalcClass.evaluate("boh@1 + boh@2", ...
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44 views

Create feature class/layer with data in python list

I want to programmatically add a layer to an MXD. The data for the layer is a list of tuples. From I what see, I need to create a feature class with this data (called invalidDataList) Below is what I ...
2
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2answers
278 views

Convert a Toolbox (.TBX) to a Python script (.PY)?

I have a .tbx tool box, which runs a script that is incredibly slow. So what I want to do is to open the python script that is running below the .tbx and make some changes or perhaps write something ...
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2answers
75 views

Renaming filenames to a standard filename format using Python

I am working within an ESRI ArcGIS environment. I have a folder full of .xyz files that are named to a specific old file format such as 2014516_MS_005.xyz I want to be able to loop through the whole ...
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1answer
45 views

gdal_grid performance issue — alternatives?

I use gdal_grid within a Python script, but for my large files the calculation time is enormous. Apparently this is a gdal_grid issue http://trac.osgeo.org/gdal/ticket/2411 Does anyone have an advice ...
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2answers
20 views

How to make a list of ESRI GRID rasters in Python

Tipically, ESRI GRIDS are not defined by a file extension like for the .tif files, but they are stored in a info folder plus an extra folder corresponding to the name of the raster. Arcpy allows to ...
3
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1answer
44 views

Making QGIS buttons and my Plugin button mutually exclusive

I've added a toolbar to the QGIS main window and I've added some checkable buttons to the toolbar. How can I make my checkable buttons untoggle QGIS default toolbars' checkable buttons? That is, ...
3
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1answer
62 views

Getting random values from geometryType() in a standalone PyQGIS script

I am asking this question based on the result I received from this earlier post. The following script only works if I set geometryType() == 3 as that is what is being printed out in the Python console ...
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1answer
35 views

smallest, lossless, GDAL ready image format

I would like to know what the smallest file format is I can use with GDAL that fulfills the following criteria: lossless compression (relatively) easy to read/write with GDAL Python bindings least ...
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1answer
134 views

How to calculate unique IDs starting from highest current ID

I have been using a python script in field calculator in ArcGIS 10.2 to add unique IDs automatically, however there are two things I would like to improve this process: Each ID also has letters at ...
2
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1answer
471 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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1answer
36 views

Concatenate Multiple String Fields and Convert to Date field using ArcGIS Field Calculator?

I'm Working in Model builder using the calculate value tool. I have three columns - SignatureDay, SignatureMonth, SignatureYear - All three are string data types and all consist of just numbers for ...
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3answers
176 views

Clipping faster (i.e. in bulk/batch) in ArcGIS for Desktop?

I have 100 different input vector layers and one clip feature vector layer. I have to clip them 100 times but its a large amount of work. Is there any Python script (ArcPy) in ArcGIS for Desktop ...
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3answers
725 views

ArcGIS Field Calculator Python numbering rows of fishnet

I have a grid of 100*100 cells. I want to add to each cell a number representing the row it is in (like in excel). I added a field and want try to solve that with field calculator: The code is ...
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0answers
18 views

How to reach the geometry (polygon, polyline) of a dxf in python-ogr module

this might be a basic question, but I am rather new in ogr. I wish to collect all lines from the dxf file and create their boundary. I loaded the layers (ExecuteSQL( "SELECT DISTINCT Layer FROM ...
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1answer
557 views

ArcPy SelectLayerByAttribute Error and how to control GP output layer name

I have a rather long script that first references an SDE feature class (non-versioned) to perform an attribute selection based on a SQL selection. I've been unable to figure out why the script will ...
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2answers
106 views

Distribute gridded data to corresponding subbasin boundaries?

I have one ArcGIS shapefile of my river basin consisting of many subbasin. Another shapefile showing the location of gridded points over the whole basin (Its latitude and longitude are used as file ...
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1answer
101 views

Creating a line along an existing polyline from a point

I have a large data set of points, all of which lie on a river network and have x, y co-ordinates. I want to calculate the slope of the river channel at each point from the underlying DEM by taking ...
2
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1answer
54 views

Clip layers in a dataframe with a polygon in python?

I'm trying to clip layers in a dataframe with a polygon using python and I've done this python script but it's giving this error:"ERROR 000840: The value is not a Feature Layer" Thanks for any help. ...
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0answers
25 views

Using processing using other output (result from another algorithm) as input

I have a problem. I am developing a standalone app in python and I need to use processing algorithms. I was able to use one algorithm without erros but I need to run other processing algorithm which ...
2
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1answer
30 views

QGIS toolbars source code

I can see the source code of the core QGIS plugins from the repository in github. But is there any repository of source codes for QGIS toolbars also?
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23 views

True Altitude of GPS cooridnates

Given two points a=(lat1, long1) , b=(lat2, long2). I want to divide the line between a and b into points with equidistant length. (for example 100 Points) For each of these points i need to ...
3
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1answer
369 views

Using Python in Field Calculator to compare two fields

I'm trying to use field calculator to compare two fields in a table of tax parcel data, Land Value (LAND_VAL) and Improvement Value (IMPRVT_VAL). My goal is to determine (1) Parcels with land value ...
2
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1answer
73 views

Run processing toolbox outside QGIS in standalone app

I am developing a standalone app in Python, using QGIS libraries including processing algorithms. I am developing in Linux environment and I put the libraries in a folder. Also I put the processing ...
2
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0answers
34 views

Efficiently generate Voronoi layers in qgis via Python

The following python commands both appear to function when called in qgis 2.6 to generate Voronoi diagrams: processing.runalg("qgis:voronoipolygons", pointLayer, 1, None) ...
2
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2answers
90 views

How to customize the QGIS default GUI using Python?

Is it possible to hide/remove/customize the default UI of QGIS from a Python plugin? I want to add my own menus and toolbars and remove some included by default in QGIS. If it's possible, which ...
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1answer
560 views

OSRM API - nearest point fed into routing

I am using the OSRM API to (1) determine the nearest point on a road segment from a give random point with http://server:5000/nearest?loc=_lat_,_lon_ The returned coordinates are used then as an ...
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2answers
97 views

Using Python For a Field Calc

In AcrMap 10.2 I'm trying to add a field and run this script in Field Calc: !shape.isMultipart! to see if I have any multipart lines. I keep getting geoprocessing failures. I am clicking the ...
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0answers
8 views

Installing Python MapScript Bindings on Windows

I've run into an issue today getting the Python MapScript bindings to behave today. Traditionally, I just use the MapScript bindings that come with the ms4w package. They had been working, although ...
2
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1answer
152 views

Problem with import qgis.core when writing a stand-alone PyQGIS script

I am trying to write a stand alone python script in windows 7 that uses qgis.core and various other qgis libraries. I have found an old question on this subject here: How to write standalone Python ...
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0answers
47 views

Connect to QGIS 2.6 Python Plugin function via button on custom feature form

I am trying to connect to a QGIS 2.6 Python plugin function via a custom feature form button. On my feature form, I'm attempting to do a few things : enable the updateButton only if the ...
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0answers
96 views

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

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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1answer
37 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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2answers
35 views

Send signal when attributes modified - QGIS 2.6

For a QGIS 2.6 python plugin, I am trying to send a signal when an attribute value is changed (values for an existing feature are updated or added and the attribute form dialog is accepted). This ...
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0answers
27 views

How to deal with contour error “Exception encountered: invalid index”

I have include vector layer using postgis database with filter(data between two dates) it work fine but after adding when I trying to make a contour from it I get error Exception encountered: ...
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4answers
3k views

Delete duplicate points in ArcGIS 10.1

Recently was doing some work on an old layer and found that when I selected one point, or used the identify tool I was returning SEVEN points when it should just be one! I am currently using an ArcGIS ...
10
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2answers
639 views

How to implement MultiValue Parameter with Multiple Columns?

This might be a simple question, but I haven't been able to find a straightforward answer. I'm working on an ArcGIS (9.3) Python script. One of the inputs is a list of features. For each feature, I ...