3
votes
1answer
28 views

Wrong scale when importing dxf into QGIS

Has anyone had the problem that the scale of the shp layer converted originally from a .dxf file turns out to be wrong? (for example I draw a line of 10 meters long in AutoCAD and imported it in QGIS, ...
1
vote
1answer
34 views

Extract lat, lon Points from Polygon

I have PostGIS database, and want to extract lat, lon pairs sequence from Polygons (and MultiPolygons). As a very fresh PostGIS user, I'm able to just extract the Polygons: SELECT ...
1
vote
0answers
29 views

from shape files to a database

I've previously converted simple shape files to WKT so that I can store them in RDMS that has spatial capabilities. I'm a new user to QGIS, which I'm using to browse a shape file. But now I have a ...
0
votes
0answers
10 views

Raster Analysis Grid (Interpolation) Crashes

Upon clicking on "Grid (Interpolation)" QGIS crashes. I running QGIS 2.2.0-Valmiera on a Mac with OS X 10.9.4 Thank you for any trouble shooting guidance
1
vote
0answers
31 views

Polygonize Missing Polygons

Polygonize is not capturing all of the pixels in an image that has been converted to 0s & 1s. The pics below show -original geotif -geotif recalculated to 0s & 1s -polygonize output As the ...
1
vote
1answer
43 views

Geodjango - trying to get points within a polygon

Edit: I think my problem might be that my data sets include shape_length and shape_area data instead of lat/long(which are included in the World Borders) so I think I need to convert it somehow... ...
0
votes
0answers
22 views

Are there reference manual pages anywhere for QGIS built-in “buffer” and plugin “points2one”?

Perhaps I am missing some quick pop-up help mechanism, but as a relative newcomer to QGIS (having cut my teeth on ArcGIS 10.1), I am struggling to find reference manuals (i.e. explanations of all ...
0
votes
0answers
8 views

GRASS GIS for geological mapping [on hold]

Has anyone used GRASS GIS for geological mapping? I am trying to perform multispectral processing on open source GIS platform as I don't have access to ENVI software. Does anyone know a way to do ...
2
votes
0answers
24 views

Encoding Greek alphabet with ArcGIS for Desktop?

I have a big type of Greek shapefiles, but a lot of time when I show the attribute table I see ?.????????? . How can I encode them? Is there any way to make ArcGIS 10.1 for Desktop encode them ...
1
vote
1answer
16 views

create a vegetation mask using Landsat 7 [on hold]

I'm working on a very large study area. The aim is to create a vegetation mask representing only pines. I'm using Landsat 7 images. Since the recordings were made in the winter it's pretty easy to ...
0
votes
0answers
16 views

Performing distance analysis and mapping collection site? [on hold]

I need generic advice on below for my semester project. We are not taught any GIS suite formally, so I went through very basics of ArcGIS 10.2, which I also have access to. May I request advice on ...
0
votes
0answers
22 views

What are Mapnik, GeoServer, CKAN, GeoNode, GeoNetwork?

I'm trying to get a clear view of the roles of different components here, this is not a "which is better" comparison, these components have different roles, but their functions overlap. (Comparison ...
1
vote
1answer
13 views

Retrieving routedescription geometry as GeoJSON

I'm building a small web-map and would wich to display a polyline representing a specific route via roads. With leafletjs it is easy to display the geometry on/over the map. So that's not the problem. ...
1
vote
1answer
44 views

How to “lower the resolution” of a lat long csv

I have a csv with 12.5 million date/lat/long/value points, it's a point every 800 meters ( in a grid ) of the united states what's the best way to convert the points to every 1600 meters? or 3200? ...
3
votes
0answers
24 views

Algorithm for estimating position of many objects and differentiating those?

Let's assume a crowd-sourced tree location use case where a research team asks hikers to GPS the location of a specific tree type in case they encounter it. This will lead to a large number of ...
2
votes
1answer
73 views

Check if line crosses a polygon

What I'm trying to do is with JSTS to check with lineGeom.crosses(polygonGeom) function if a line is crossing completely a polygon. The problem is that both cases from the picture returns true. I ...
1
vote
1answer
26 views

Loading GRASS gives error installing QGIS Chugiak on Windows 8.1?

I am experiencing a problem installing QGIS 2.4 Chugiak on Windows 8.1, resulting in a error loading Grass. This may be a problem only affecting certain installations, I'm not sure. I am a noob on ...
2
votes
1answer
47 views

data source for worldwide cross-sections of topographic and bathymetric for woodworking art project?

i am a decent r programmer and statistician, i am able to work with data sets pretty well. i am less familiar with GIS tools, but if given a shapefile i can certainly plot political borders and ...
0
votes
0answers
16 views

Show graph in html popup for dynamic data of a postgresql table

I am trying to plot xy value from a postgresql database table. In the table there are multiple longitude and latitude corresponding to values. The table is like this, where all longitude and ...
1
vote
2answers
25 views

Looking for tool to start ArcGIS for server 10.1 services automatically

Is there any tools or scripts to start ArcGIS server 10.1 services automatically when the services are stop? Thanks
1
vote
1answer
18 views

How to add labels parallel to lines, polylines or multilines using Leaflet?

I want to add road name parellel to its line or if the line is curved, then the label should also be curved. How to add these name labels using leaflet? example image
0
votes
0answers
39 views

Python + GME (Spatial Ecology) + Subprocess.call

I'm trying to run the following code to use GME commands in Python. import arcpy,os,subprocess from arcpy import env env.workspace=r"D:\Users\myname\Desktop\aviso" count=0 for raster in (f for f in ...
1
vote
1answer
43 views

Why is arcpy.da.SearchCursor code giving AttributeError: 'int' object has no attribute 'split'?

I am new to python and am trying to get a string field in a geodatabase table to split and create a new row. Here is the code based on the solution from Splitting strings into new rows, retaining ...
2
votes
1answer
47 views

Defining projection, reprojecting, and wrong area values [duplicate]

Apologies for duplication--this was mentioned in a previous post, but was suggested that this specific problem should be posted separately. My data: http://water.usgs.gov/GIS/dsdl/aquifrp025.tar.gz ...
1
vote
0answers
37 views

ArcPy Multiprocessing 000714 - Working in Debug Mode

In an attempt to render an interactive window via matplotlib I am using an out of process script in a toolbox. If I debug the script, it is possible to step through and render the window as expected. ...
0
votes
2answers
31 views

Dealing with custom projections (from prj file) in PostGIS (also GeoServer and OpenLayers)

Basically I want to perform spatial queries like distance calculations in PostGIS using data from shapefiles with different projections, some of which have no SRID code that I can find and also which ...
0
votes
1answer
16 views

Trouble with r.out.gdal in GRASS GIS

I'm processing some landsat 8 files. I'm using this scene LC82260982013325LGN00 and I have to apply i.landsat.toar and export the result as a GTiff. However when I use r.out.gdal it takes a very long ...
6
votes
0answers
63 views

What are the pros and cons of forcing square pixels on reprojection?

I am using Erdas Imagine 2014 to reproject 4-band raster data from GRS 1980 NAD83 Lambert Conformal Conic (ft) to UTM GRS 1980 NAD83 North UTM Zone 11 (m). Unlike ArcGIS, Erdas provides the option to ...
0
votes
3answers
28 views

Using search cursor to determine renaming of feature class

What I am trying to do is create a list of shapefiles based on field name values. From there I would like search on 1 field (each shapefile will only contain 1 row) and if the value in that field is ...
1
vote
1answer
45 views

Accuracy issues between data in QGIS and Google Earth

Wondering if anyone can answer this question. I have a kml in Google Earth. When I import it to QGIS, and then import the Google Earth images they are in slightly different places. I used a QGIS ...
2
votes
1answer
20 views

Print Maps - OpenLayers, GeoServer, GeoExt, MapFish

Can anyone point me towards a clear and unambiguous description of how to install and code a very simple map print function for OpenLayers/GeoServer? I am using GeoServer 2.5.2 and OpenLayers 2.12 on ...
0
votes
0answers
15 views

Neighbours list extracted out of polygon regions

I've got a SQL database which contains some coded polygon structures. Those can be extracted as follows poly <- data.frame(sqldf("SELECT ST_astext(geometry) FROM table")) The data.frame 'poly' ...
1
vote
1answer
17 views

Local Coordinate System

I am currently evaluating the use of PostGIS (version 2.0) for: a project that will store 3D coordinates (x, y, z) data the data will have it's own local coordinate system which does not correspond ...
0
votes
0answers
16 views

QGIS error when add WFS

I'm running QGIS 2.4.0-Chugiak on win7 64bit and am getting the following error while trying to add a wfs layer (using the simple Add WFS layer command): The layer ...
1
vote
1answer
22 views

Couldn't load SIP module (QGIS doesn't load Python)

I recently installed QGIS 2.4, but Python does not load. I am running on a Windows 64 bit machine. I receive the error message "Couldn't load SIP module Python support will be disabled". Traceback ...
0
votes
0answers
28 views

Shapefile to KML automatic updates (ModelBuilder)

I am trying to set a model to where it can automatically update a KML only when there are new features added or modified to my shapefile. Trying to avoid having to convert periodically. Can anyone ...
1
vote
1answer
44 views

Qgis - Labels automatically resize to fit within the polygon

The question of my problem is simple, I want to make labels automatically reduce to fit within the polignos. Type the biggest size is 12 and goat decrease the size to be restricted to the limits of ...
1
vote
0answers
22 views

Snap (editing tools) in ArcGIS not working properly

I am using the snap tool to match one polygon file to another, using the EDGE Snapping Environment Type Option. The tool appears to work properly for the vertices of the input feature polygons that ...
4
votes
2answers
51 views

Is there a difference between the Planchon & Darboux and Wang and Liu depression filling algorithms? Other than speed?

Can anyone tell me, based on actual analytical experience, if there is a difference between these two depression filling algorithms, other than the speed at which they process and fill depressions ...
1
vote
0answers
18 views

ora-01747: user.table.column, table.column or column description is invalid

everyone. I created a table in oracle with a sde.st_geometry column. I followed the instructions of ArcGIS help to register the table into geodatabase. However, when I try to load data into this ...
0
votes
1answer
15 views

What to do in CartoDB so that null/zero values are not shown on the map?

I've created a map and want to present some data with the bubbles (supply-demand), but in some locations the supply is zero. I don't want the bubble to be on the map in those cases. How can I do it? ...
1
vote
1answer
40 views

Controlling Python Version from ArcGIS?

I am writing a VB.net console application that calls ArcGIS Desktop 10.1 ArcToolbox geoprocessing tools from my code. Some of these tools use Python syntax and I am encountering a problem that I ...
0
votes
3answers
49 views

Adding XY Points to ArcMap 10.2

I am trying to import an Excel table with around 10,000 XY points into ArcMap 10.2. I am using State Plane NAD 1983 Alabama West (US Feet) as the Coordinate System in my map data frame. I then add the ...
2
votes
2answers
62 views

Using multiple wildcard parameters with arcpy.ListFeatureClasses

I know there has to be a way to do this but I'm having trouble figuring out how to do so. I would like to create a list of feature classes to perform operations on however, I want to have the list ...
1
vote
0answers
10 views

Is it possible to leave a field null when using the calendar widget in QGIS?

I'm creating and editing data with QGIS, the data is stored in a Spatialite database but I've run into this issue with shapefiles as well. I have a field I'm storing dates in and I want to use QGIS' ...
0
votes
0answers
19 views

What projection to use with Mapbox base/reference layers?

excuse me if this has been asked before, but I can not find answer after heavy googling. What coordinate system/projection does shapefiles need to be in to be alligned correctly with mapbox reference ...
2
votes
2answers
73 views

Does ArcMap have a Pan To Layer command?

In an Attribute Table, I am able to choose Pan to Feature (rather than Zoom to Feature) to refocus the map without changing the zoom level. Is there a similar Pan to Layer option (and/or shortcut key) ...
1
vote
2answers
26 views

Identifying my coordinates from external datasource

I'm working with data received from an agency outside of my office and two columns in the dataset are labeled 'CompX' and 'CompY'. Here is a sample set pulled from the spreadsheet: ...
0
votes
1answer
40 views

Cannot put a layer name as the same as the raster name just created by Python script

I have a question regarding Python script for making a Heat Map Tool. I am making a Heat Map Tool where users can set the map extent, the tool will read the current scale of the map, then make a ...
0
votes
1answer
35 views

Field Calculator not showing some fields

When I open my attribute table, click on a column, and select Field Calculator it opens and doesn't list all of the Fields in my attribute table. Why can't Field Calculator find these Fields?

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