Tagged Questions

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

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0
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0answers
13 views

Sextante script for statistic info

I want to generate a script for getting statistic info from 2 layers. One of the layer is in polygon geometry another one is in linesting geometry. I just want to get a screen about basic statistics ...
0
votes
1answer
22 views

ARCGIS Python script (needs a raw input line to let the user choose the output file name)

I just need a quick fix here. Having trouble finding a way to allow the user to input the new output file name (the one that is created after the buffer function completes). Any ideas? I am also not ...
2
votes
1answer
43 views

Visualize shapefile in Python

I was searching the internet to see if it is possible to visualize geographical data in Python, without always opening ArcGIS and make a map (because I have a lot of scripts that uses arcpy). On the ...
0
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0answers
26 views

How to write vector layer to csv file with geometry?

I try to write vector layer file to csv file with this code QgsVectorFileWriter.writeAsVectorFormat(mylayer, r'c:\temp\xyz.csv', "utf-8", None, "CSV") it can export to xyz.csv but only attribute ...
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0answers
13 views

How to set transparent geotiff by GDAL? [duplicate]

How to set transparent geotiff by GDAL? I get png with transparent background but i use gdal_translate - background is with.
0
votes
1answer
19 views

how to loop grass command in python and put variable in output file

anyone, first day Grass programming with python scripting; first prob; simple I want to reclass the same raster several times; and save the file with the value loop variable at the end ... can not ...
0
votes
1answer
19 views

Apply Symbology to a group layer

I currently have around 200 features that all need have the same symbology applied to them. I have used the ApplySymbologyfromlayer_management however this takes much to long to process, at least a ...
4
votes
1answer
62 views

How to set up Python 2.7 to work in both QGIS and ArcGIS?

I have both ArcGIS 10.1 and QGIS 1.8 installed and both include Python 2.7 in slightly different setups and in different folders (c:\Python27\ArcGIS10.1\ and c:\Program Files (x86)\Quantum GIS ...
1
vote
1answer
29 views

How to iterate all input folders (containing coverages) using Python with ArcGIS 9.3?

I'm trying to write python scripts to batch convert thousands of coverages to shapefiles in arcgis 9.3. The coverages files are in different folders: d:/area_A/building d:/area_B/building ...
0
votes
0answers
31 views

Fill up polygons with field value

I have now defined my renderer with a color map I want to fill it with a value in the end field of my shape file's attribute table with python how to do it?? I use QGIS 1.8.0 with python 2.7.3
1
vote
1answer
35 views

Python - GDAL: spatial filter

Is there a way with GDAL (Python) to set a spatial filter (bounding-box) on a raster before I process it? I want to read it as an array. BandReadAsArray(band, xoff=0, yoff=0, win_xsize=None, ...
3
votes
1answer
33 views

How to check via Arcpy if ArcMap is currently in an edit session or not?

I've created a Python add-in button that helps speed up my coworkers workflow by copying one feature class attribute to another. It uses the arcpy.UpdateCursor function to update a row in the target ...
5
votes
2answers
61 views

How to create a point along a line given a distance from another point

I'm trying to figure out a point(D) on B-C that is a specific distance from A. I really don't have any idea on how to proceed with the ellipsoidal math so I figured I'd ask here. How would I figure ...
0
votes
0answers
16 views

connexion to postgres and update attribute table of a shapfile in QGIS [duplicate]

I have created a plugin with "plugin builder" , now I search to connect my plugin to postgres. I have a shapfile and I try to find a script in Python that can use to assign a SQL query to my table ...
0
votes
0answers
32 views

OD cost matrix Arcpy

I'm trying to create an OD cost matrix python script. I'm doing an OD cost matrix analysis. I'll find out the average time with patients to hospitals over 10 years. When I do this analysis, the ...
0
votes
0answers
19 views

Receiving Label Expression error

Writing simple label expression in python. It looks like this [Well_Name]+'\r'+ [TCA] . They are both string fields. I receive the following error "TypeError: coercing to Unicode: need string or ...
0
votes
0answers
12 views

In QGIS Python can you nest QgsFeatureIterators on the same layer

I'm using the QGIS Weekly 1.9.0 in order to access the getFeatures(QgsFeatureRequest) method. The script is run in the Script Runner Plugin v0.71 Can anyone tell me what's wrong with this code? The ...
-1
votes
0answers
45 views

How to assign a SQL query to a table attribute? [closed]

I have created a plugin with "plugin builder." Now I seek to connect my plugin to postgres. I have a shapefile and I try to find a script in Python that can assign a SQL query to my table attribute. ...
2
votes
1answer
71 views

Python Code: “Compare two fields and select missing records”

The code I wrote is not right!! It's selecting more than what is actually missing. I think I'm wrong on the matched code line. I need the script to make a list of the "FLAG" field and a list of the ...
2
votes
3answers
88 views

What are efficient algorithms to join segments and to split a line into segments?

Referring to the Figure below: How to efficiently join segments into lines? How to efficiently break lines into segments? The above will be applied million times.
3
votes
1answer
34 views

ArcObjects (VB.Net) Python Integration with object passing?

This link illustrates one method for calling python scripts from within an ArcObjects environment. The results of these tasks are returned as strings. I wonder if it is possible to call a python ...
1
vote
0answers
46 views

Change ArcGIS License using Script

I am using ArcGIS Desktop 10 and we have three different servers for accessing concurrent use licenses of ArcView, ArcEditor and ArcInfo. So, whenever I need to switch to other product, I have close ...
1
vote
1answer
32 views

Combining polygon geometries with python and QGIS segfaults

I am trying to combine polygons, using Qgis 1.8, and every time I run this script in the python console, I get a segmentation fault. Here is the script: from PyQt4.QtCore import * iface = ...
0
votes
0answers
20 views

How to change value of an Line edit dynamically

I create a form in QT4 and compile with pyuic4. it create an form.py I want to modify the value of the line edit dynamiclly with code. I put this code in the form.py but never happen: ...
0
votes
1answer
40 views

Make many lines in one layer (Python)

I what to create many lines with this code: v_layer = QgsVectorLayer("LineString", "cable", "memory") pr = v_layer.dataProvider() seg = QgsFeature() ...
7
votes
1answer
86 views

Difference between python window and toolbox

Are there differences in performance or other potentially critical area between running a python script in the python window versus running it from the toolbox in ArcGIS 10.0? I am asking in cases ...
5
votes
1answer
66 views

Python - OGR: Transform coordinates from meter to decimal degrees

I have a point in a shapefile. The shapefile is in a WGS_1984_Web_Mercator Projected Coordinate System. I want to get the coordinates of that point in decimal degrees with GDAL/OGR in Python. I am ...
0
votes
2answers
67 views

Python to get ids from shp dont return all records

I have some Python code to get the ids and georeference from a shapefile: canvas = qgis.utils.iface.mapCanvas() allLayers = canvas.layers() nos = QgsFeature() for i in allLayers: if ...
0
votes
1answer
73 views

How to convert geometry of SHP to decimals

I try to create a line with two points. These points are obtained in a SHP layer. How can i convert that points to decimals? Thank you
11
votes
1answer
101 views

Watermarking photos using their geotag and create a shapefile

I have geotagged photographs and I would like to place a watermark of the photos location on the front for easy reference as well as creating a shapefile from the coordinates. Does anyone know of any ...
0
votes
0answers
68 views

python script to calculate and return values based on several conditions

I need to calculate and return the value "continuous" to those records in a polygon feature class with species records aggregated to a UTM grid considering the attributes are species name, grid code, ...
1
vote
1answer
79 views

How to use CURRENT map document in Python tool?

I am attempting to use this code in a tool that I am working on: mxd = arcpy.mapping.MapDocument("CURRENT") df = arcpy.mapping.ListDataFrames(mxd)[0] XMIN = df.extent.XMin YMIN = df.extent.YMin XMAX ...
0
votes
0answers
21 views

How to get Perpendicular cross section along the river using python and Arc Map 10? [duplicate]

I need to draw the perpendicular line segment along the river at a regular interval. How can i obtain like this output using Python and Arc Map 10 ? I would be very grateful if you give some idea..
3
votes
2answers
70 views

Python split table by “State” field and export to individual tables?

So I have never posted here before. I have used the site a lot for help so many thanks to all the great contributors. So, I have used ArcGIS online to perform batch geocoding (18,000) records and it ...
0
votes
1answer
30 views

QGIS Python - Convert geometry from Postgres to QgsPoint()

I have made a query in Postgres to get some points to use with python. This points are in geometry data. How can I convert that geometry in decimals to use QgsPoint() in python? Thank you
-1
votes
1answer
50 views

How can i draw a perpendicular line in a stream segment in a regular interval of 30m? [duplicate]

I have a stream segment which is polyline feature. Now I want to draw a line which is perpendicular to stream segment at a interval of 30m. How can i do it using python ? Do you have idea on this .
1
vote
1answer
70 views

Can I open a form in layer action?

I want to open a form (made in QTDesign) in the layer action. It is possible?
0
votes
0answers
15 views

AddLocations_na not loading routes properly from python script

I am trying to do network analysis with python from ArcGIS 10.0 but AddLocations_na is not loading the routes from the routes attribute table. It works for depots and orders quite well however. The ...
3
votes
0answers
45 views

Accessing arcpy functions from IronPython

I made a few python scripts to automatically optimize and publish my data.. Now i'm thinking about writing a .NET program to manage and run these scripts: the obvious way is invoking them in a ...
0
votes
1answer
44 views

How to insert values from one table into another?

I am trying to write a script that iterates through each row of a table, calculates for this row something. The result of this calculation is finally stored in another table (with just one row). Now I ...
0
votes
0answers
17 views

QGis non blocking notifications with pyqgis [duplicate]

I'm searching for the way to use the new QGis non blocking notification system with the QGis python wrapper. I found informations on this fonctionnality but nothing on how to use this especially with ...
2
votes
1answer
45 views

Tabulate Area crashes Python and ArcGIS

I have a script that runs Tabulate Area on a single feature class multiple times with different rasters. In total Tabulate Area runs 5 times. 2 of the input rasters are provided as arguments to the ...
0
votes
1answer
30 views

Arcpy Network Analyst solver error

Hello GIS Stack Exchange, I am finding it difficult to load locations to sublayers using python in ArcGIS 10.0 network analyst Vehicle routing problem. I'm also having some trouble debugging my ...
0
votes
0answers
23 views

using python and arcpy , how can I compute the direction and angle of a line segment? [duplicate]

if start_point_x < end_point_x and start_point_y > end_point_y: slope = ((end_point_y - start_point_y)/(end_point_x - start_point_x)) radian = math.atan(slope) degrees = ...
1
vote
0answers
32 views

Calculating the Centroid of polygon in modelbuilder (VBA to Python) [closed]

Got an easy one, that's got me stuck. I'm moving some models that were created in 9.3.1 to work in 10. Part of the model is calculating the X coordinate of a polygon to a specified field. The code ...
0
votes
1answer
47 views

arcpy.setValue for Condition from Dictionary

Hi: I am trying to create a function to update multiple fields based on different criteria. I want to pass the field name and condition thru' a dictionary (please see the function description in the ...
1
vote
1answer
45 views

Python GDAL: find out spikes and pits in DEM

I'm working with on a DEM (Geotiff) in Python GDAL, and I'd like to find out the spikes or pits in my terrain. I have no idea how to proceed, does anyone have good algorithm to help me out? Thanks, eo ...
1
vote
2answers
61 views

Set Extents of MXD to new layer data source?

Alright here I go again this forum has been good to me. I add a layer and replace its data with a shapefile I created using the following bit of python: layer = ...
1
vote
3answers
100 views

Create Text files from a loop with Python? [closed]

I need to create some files to hyperlink to from Arcmap. I have a folder of jpeg files (100.jpg, 101.jpg etc...). I need to loop through them and create a text file of the same name except replace the ...
1
vote
2answers
53 views

ArcGIS 10.1: “ERROR 000223: Cannot extract event table properties” when iterating through multiple files/folder

I am trying to convert ~270k csv-files with lat/long-data to layerfiles. The files are split into folders by year, i.e. ~30 folders with ~9k csv-files in each. I have written a script to iterate ...

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