3
votes
1answer
95 views

Is it possible to create DEMs from ORT format in QGIS?

I recently requested DEMs for my area of interest. The data has however arrived in ORT file format - how do I create DEMs from this data in QGIS? When I open the files in Notepad there are three ...
6
votes
3answers
7k views

Check if lat/long point is within a set of polygons using google maps

I know how to do the above using Esri (Query task on shapefile), but can this also be done using Google Maps? Do I have to query each polygon or is there one method to query a set of polygons?
3
votes
2answers
109 views

pgRouting - Make fails on Mac

I am having trouble getting started with pgRouting. 1) from binary The Kyngchaos binary just won't install and says it requires PostgreSQL 9.1. I do have it, but probably not where the binary ...
1
vote
0answers
192 views

How to config geoserver to read style of vector layer from postgis/SQL store?

I've imported vector layers from map info pro to both SQL server and post gis using easy loader. In both cases I've included style column in the exported table. When I create new store in geoserver ...
1
vote
1answer
84 views

How to fix PJ_healpix.c in PROJ.4?

Michael Speth and i are in the process of fixing the PROJ.4 implementation of the HEALPix map projection (see http://trac.osgeo.org/proj/browser/trunk/proj/src/PJ_healpix.c for the current buggy ...
1
vote
0answers
207 views

How to integrate XML markers with MarkerCluster?

I'm having a problem integrating XML markers with MarkerClusterer. I need to integrate these two and show only the markers within bounds. I'm able to load the results in the XML to the map, but can ...
1
vote
1answer
248 views

Export Web Map Task for 3076 features

I am trying to use Export Web Map Task but it has a limit of 1000 records, how can I use this service or replicate this service to execute my print command. Any suggestions? I am working on ArcServer ...
3
votes
1answer
385 views

How to emulate the modulo operator in a style rule?

I have SHP layer loaded in QGIS. It consists of lines with attribute column z, containing integer value associated with line elevation in meters. Lines are drawn at 10 meter increment, and I want to ...
1
vote
2answers
109 views

Why is result from gp tool not being created on JavaScript API?

Ok I am really confused. I can see the output of the result from geoprocessing tool. But why am I not able to add it to the map. As you can see the result returns all the attribute values. This is my ...
4
votes
1answer
6k views

How to do a simple find and replace in QGIS field calculator?

I'm trying to replace selected string values in an attribute table, eg. "Text1" for "Text2" (QGIS 1.8.0), patriculary for those rows with NULL values. I have been trying to use the replace expression ...
4
votes
3answers
574 views

Can I publish a Bing map from OpenLayer Plugin in my thesis?

I have QuantumGIS 1.8.0. I made a map that I'd like to use in my thesis. I made it using Bing road layer map. I found it in open layers plugin. Do I have the rights to publish the map as a part of my ...
0
votes
2answers
179 views

Why does a track point layer attribute table have no positional information?

I imported a track log in GPX format to QGIS. The track had two layers, the track points and the track, a smooth line joining the track points. Why does the attribute table for the track points have ...
4
votes
1answer
289 views

How to extract most probable flow line from multiple lines?

I have to apply uncertainty principle to computing flow accumulation using Monte Carlo method. I generate raster with random numbers which represents mistakes in creating DEM. Then I apply those ...
17
votes
3answers
4k views

What are the alternatives to Manifold GIS?

Question from my father who is looking to explore alternatives to Manifold: "I am an independent environment consultant who is a heavy user of GIS for spatial data crunching, geo-referencing ...
0
votes
1answer
185 views

Feature count of current features in Extent based on attribute?

I have one points layer in a cached map service, symbolised with a unique renderer on one field. e.g. petrol stations, symbolised by the company who owns them. I want to create a fairly basic ...
2
votes
2answers
536 views

Why does Raster Calculator return GRID ERROR-Unable to open input grid?

I'm calculating Simple Ratio (SR) from NDVI using Raster calculator in Arcgis. Here is expression I wrote in Raster calculator. SR=(1+float[NDVI_apr.tif])/(1-float[NDVI_apr.tif]) But when I ...
1
vote
1answer
56 views

Prompting Dialog Box to Have User Enter Information without ArcGIS Engine?

Working with the ArcGIS family v10.1 on Windows 7. So, I have this vision for a GIS project that does the following: User opens up ArcGIS Explorer (ideally) or ArcMap (still fine), or I guess even ...
2
votes
0answers
319 views

How to use GRIB data in ArcGIS? (Zonal Stat as Table)

I am trying to calculate zonal stats as table with a python script for 45 .grib files from the ERA-40 Monthly Mean of Daily Mean database (http://data-portal.ecmwf.int/data/d/era40_moda/) for certain ...
5
votes
1answer
288 views

PostGIS ST_Rotate distorts polygon

I'm trying to rotate a box around its southwest corner using PostGIS. However, I am not getting the expected results when doing the rotation. I'm using SRID 3785. The image below shows what ...
0
votes
1answer
127 views

Creating rectangle over a buffer circle with specified angles/rotation?

I have a layer that is a circle buffer around a point. What I want to do is create a rectangle around the circle, but have every rectangle be perfectly lined up N/S (0degrees of angle/rotation). I ...
0
votes
1answer
134 views

How Trusted is ZipInfo.com's data?

I'm not in GIS, and I'm working on a nutty redball express project that involves matching some zip+4 data to congressional districts for the upcoming 113th congress. We have found very few sources of ...
7
votes
3answers
2k views

GDAL and Python: How to get coordinates for all cells having a specific value?

I've got an Arc/Info Binary Grid---specifically, an ArcGIS flow accumulation raster---and I'd like to identify all cells having a specific value (or in a range of values). Ultimately, I'd like a ...
1
vote
0answers
374 views

How to visualize MBTiles with OpenLayers using a PHP tile server?

This is repost as didn't get my expected answer. Please help me as I am newbie. I have setup the PHP Tile Server 0.1 and when I am calling the PHP server it showing the following Now I am triyng to ...
2
votes
1answer
2k views

Building a thin mapping client with OpenLayers

I have installed GeoServer, inside of tomcat, imported my postgis tables into geoserver and have created my styles etc. I can preview them using openlayers in geoserver. Now, i want to build a simple ...
3
votes
1answer
3k views

Import GPX file to QGIS and correct apparent CRS problems

I am using Easy Trails software on an iPhone to output a gpx file of a walk. When I import the file (import vector layer) to QGIS, into a project with OSGB information and the correct CRS for OSGB ...
6
votes
3answers
3k views

Is it possible to postprocess Trimble .ssf files without Trimble Pathfinder Office?

Is it possible to postprocess Trimble .ssf files without Trimble Pathfinder Office (differential correction - our sporadic use does not defend realtime correction subscription) ? We only need the ...
0
votes
1answer
842 views

What do I need in order to show offline map (tile cached based) of area from OSM using Openlayers?

I want to make an offline map with certain zoom levels of an area from OSM (preferably keeping the styles of OSM). Client will use OpenLayers , If needed I can install Geoserver/Mapserver and MS-SQL ...
2
votes
1answer
502 views

How to integrate Openstreetmap in Rails3.2 using Mongodb?

I'm planning to use Open street map in my Rails app to track locations, Can any one guide how to integrate Open street map with Rails 3.2, using MongoDB. Thanks
1
vote
1answer
492 views

How to convert images from the South African co-ordinate system to WGS84 lat/long?

I have a number of orthophotos for an area in South Africa, but they are projected in the South African co-ordinate system which measures a location in meters from a central (uneven) meridian. These ...
2
votes
0answers
90 views

SLD file already exists

Using Geoserver 2.1.3 I do delete sld using rest api with manually delete the sld file. But when I issue a POST new sld with the same name I got an error "SLD file test.sld already exists." Event ...
3
votes
2answers
2k views

General GeoDjango Opinion

I'm forced to crawl out of my intranet and create a public GIS site with quite an extensive dataset. All of my data is contained within PostGIS. I started dabbling with Geoserver/Postgis/OpenLayers ...
3
votes
3answers
1k views

Spatial index to speed up the query

I have spatial table in PostgreSQL 9.2 / postgis 2.0 that I have to extract some information from it. But my query is hopelessly slow. How could I make use of spatial index to improve the performance ...
1
vote
1answer
1k views

GPS data validation

I was wondering if Fix quality data from GPGGA, can be substituted to Validity field in GPRMC? In my application I have to use only GPRMC, but I don't really know if it sets validity only if Fix ...
4
votes
2answers
629 views

Where can I find Ethiopian electoral constituency and district (woreda) boundaries data?

I am a PhD student in Development Studies in Oxford. I'm trying to find a map of the Ethiopian electoral boundaries. These are not the same as the district (woreda) boundaries - districts can be in ...
4
votes
3answers
2k views

What's the easiest way (style wise) to publish my MapInfo map as WMS?

I've downloaded data for my country from OSM and let a GIS expert to style it for me in MapInfo pro. (I have TAB files and .wor - workspace). When I tried converting them to SHP (for QGIS) I've ...
1
vote
0answers
268 views

How can I use Convex Hull to select an area with a space from the points?

This refer to this post : Read Here My goal is to select an area covering some points, but maintaining some space from points of border, like in the follow picture : I think ST_Convexhull will do ...
7
votes
1answer
628 views

How to set up GeoDjango with PostGIS 2.0?

I would like to run GeoDjango (Django 1.4) with Postgis 2.0. Whenever I try to run syncdb I get the following error for geographic fields: Failed to install index for stores.Store model: operator ...
2
votes
1answer
462 views

Detect city from coordinates

I need to know how to detect which city belong certain coordinates. Wich is the best way to do this? Thanks in advance. Pd: excuse my english
10
votes
6answers
3k views

Options for Open Source Cloud GIS?

I'm looking for an open source cloud GIS solution. Current situation: Up to 100gb of data stored in file geodatabases that is updated daily. Data is used to create maps as well as geoprocessing ...
3
votes
1answer
584 views

How to run OSgo4W shell script on Windows?

I have a lot of DEMs that I want to use to create hillshades, slopes and color relief from and would like to automate the processes using a shell script within OSgeo4W shell. Here is the code I used ...
4
votes
4answers
3k views

How to concatenate numbers and add in leading zeros?

I have three text fields populated as follows: 1, 9, 1 that I need to concatenate into a field that looks like 01.09.01. Getting to 1.9.1 is easy but can anyone help out with how to formulate it so ...
3
votes
1answer
151 views

Points warped when exporting to shape

I have recently purchased a Trimble GeoXH (used) and have done a few surveys. I have done differential correction in Trimble Pathfinder Office and all points seem fine. When exporting to shape and ...
3
votes
1answer
2k views

How to get attributes of overlaying polygon layers by a spatial query?

I am new to QGIS and would like to merge selected data/attributes out of the attribute tables from overlaying vector objects on different vector layers without creating new additional layers. Is ...
2
votes
0answers
199 views

How can I map polygon value distribution?

I'm surveying an area and have a z-value attached to each polygon. In comparison to the area I'm studying the polygons are quite small. What I'm trying to do is show the distribution of this value. ...
2
votes
0answers
679 views

why preview image is blank for ImageMosaicJDBC (postgis raster) layer?

I follow http://docs.geotools.org/latest/userguide/library/coverage/pgraster.html to publish a ImageMosaicJDBC layer in geoserver. the layer seems published ok and saved, but the preview of this layer ...
1
vote
1answer
280 views

Merging data in Quantum GIS

I have a set of postcode boundary data that currently goes down to the most detailed level possible, like this: AB1 2CD I would like to 'simplify' the data so that it just shows the first part of ...
4
votes
1answer
380 views

Is it possible to run an arcpy execute SQL method without connecting to any database or server?

I want to simply process a layer by writing a tool script in a toolbox without having to connect any database, so I think I may have to set up a workspace environment in ArcMap, but I'm not sure if I ...
2
votes
1answer
277 views

GeoServer: Show (Random?) Subset of Features

Background We have a GeoServer layer backed by a PostGIS table with 22 million smallish features covering the continental US. We're using GeoServer to serve the features as a WMS layer to a client ...
13
votes
3answers
2k views

Why Do Colors Look Darker When Printed on Paper?

I made a map with a terrain-colored relief-shading in the background. I then exported them as PDF from Print Composer in QGIS. But when I print the PDF onto paper: the shaded-relief color in the ...
1
vote
1answer
915 views

Where to execute sdetable command in Windows?

I am trying to fire some Sde Command in Arcgis Desktop 10.1 but I am not aware where to execute the command in windows operating system.Thank you in advance.

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