2
votes
2answers
557 views

onSelect sometimes firing before onUnselect

I have a map that displays satellite coverage zones. Some of these coverages overlap. I am using the SelectFeature functionality to fire off onSelect and onUnselect events. However, when moving ...
2
votes
2answers
459 views

Workflow process to style vector data using GeoServer

I'm starting to get a better understanding of map-servers in general, but I am still unclear on how best to use GeoServer. At the moment, I use web-hosting to store the web-browser related parts of my ...
1
vote
1answer
416 views

Rasterize difference between QGIS and FWTools

I am wanting to use FWTools to rasterize a large number of Shapefile polygons. I have used the Rasterize tool in QIS and it works great. But when I use the generated code in FWTools the process does ...
4
votes
1answer
1k views

Transparency in ArcMap Graphic Elements

Is it possible to apply transparency to graphic elements in an ArcMap layout? I'm specifically refering to a neatline -- a box containing my legend, source info, scale bar, etc.
0
votes
1answer
1k views

Problem adding WFS Layer to QGIS project

I want to load data using an WFS into qgis 1.7.4. After connection to the server is established, data seems to be downloaded, but no data is displayed in qgis, neither geometry nor attributes. The ...
5
votes
2answers
375 views

How can I setup a simple web mapping system?

I'm new to mapping and GIS and I'd like to setup a mapping system to display informations on a map, I think the following could work but I'm not sure how good it is.. 1- I store my data (lat, lng ...
5
votes
1answer
8k views

Assign Icons to specific points dynamically in OpenLayers

I have a json file describing features on a map (routes, points etc) points include places of interest such as airport, harbor etc. Is there a way to assign icons to these points? example: have a ...
0
votes
1answer
118 views

QgsLegend link error when building

I'm developping a software using QGIS. When building my software there is a LINK error. 1>mainwindow.obj : error LNK2019: symbole externe non résolu "public: __thiscall ...
1
vote
1answer
381 views

Check multiple feature classes have same spatial reference

As the title says I've several feature classes. I want to check whether they have same spatial reference using arcpy
2
votes
1answer
199 views

Sandbars feature extraction from satellite image

I want to know if we can analyse the permanancy of sandbars from a satellite image? Whether the formation of the sandbar is permanent or temporary.
2
votes
1answer
148 views

How to use IObjectClassEvents?

I need to use IObjectClassEvents in my project. I don't know how to start, can any one give me a simple explanation, or an example in C#.
5
votes
2answers
4k views

How to export .mdb file to shapefile?

I have received some GIS files, in .mdb format. Is it possible to project this .mdb file onto my map; say by converting it into shapefile etc? In Mapinfo Professional, i could open this .mdb file ...
1
vote
1answer
68 views

Estimation of hydraulic head

I am trying to estimate hydraulic head using SRTM DEM. My objective is to calculate hydropower potential using the hydraulic head and inflow among others. The problem is I do have estimate of head. ...
1
vote
0answers
243 views

PostGIS reports invalid Curve GML

PostGIS version POSTGIS="1.5.3" GEOS="3.3.1-CAPI-1.7.1" PROJ="Rel. 4.7.1, 23 September 2009" LIBXML="2.7.3" USE_STATS Postgresql version PostgreSQL 9.1.2 I'm having issues inserting Curves into a ...
4
votes
1answer
3k views

Best way to get Convex Hull/Boundary of millions of points

I've been trying to do some point analysis on some xyz data, I'm at the point where I've decided it is best to produce a boundary of my xyz files and put this with the metadata for each survey. Now ...
2
votes
1answer
1k views

using raster calculator

I have a combination method to combine two raster( raster x and y) . the method is : x+y / 1- min(|x|,|y|) my problem is about "," character .whats the "," means in the method and how can i use this ...
4
votes
3answers
4k views

How to generate a shapefile containing an UTM grid (graticule)?

I'm looking for a shapefile containing an 1000m or 2000m UTM grid ("graticule"). All I was about to find on the web is a 10000m UTM grid (here: http://en.giswiki.net/wiki/UTM) and I am aware that a ...
4
votes
1answer
432 views

Dividing a geographic region

I have a certain geographic region defined by the bottom left and top right coordinates. How can I divide this region into areas of 20x20km. I mean in practial the shape of the earth is not flat it's ...
2
votes
3answers
328 views

Get the LatLon of middle points of a road segment?

Suppose I have the LatLon of the two end points as well as a small number of middle points of a road segment. What is the best way to calculate the LatLon of a middle point P of the road segment ...
1
vote
1answer
770 views

split multi line by use of distance field [duplicate]

Possible Duplicate: Splitting lines automatically at specific distances? i have a transect layer with 160 transect . id like to split each transect with specific value from the beginning of ...
4
votes
1answer
249 views

Is it possible to change the year range of time manager in QGIS?

I have a shapefile with a start and end time field, properly formatted. However my dates range from 1864-1995. When I try to use the shape file with the QGIS time manager plugin I keep getting this ...
3
votes
1answer
81 views

How to prevent user from deleting a feature?

How can I prevent the user from deleting a feature? void m_editEvents_OnDeleteFeature(IObject obj) { // Code }
1
vote
1answer
419 views

Quantum GIS Garmin Maps62 device and GPS utility - making a polygon for random point

I have a Garmin GPSMaps62 unit and GPS utility. I have logged tracks and need to get these to load as polygon layers in Quantum so that I can then ask Q to give me random sample points and upload ...
1
vote
1answer
135 views

What is the difference between the astar_sp and shortest_path_astar functions?

I want to ask about what different of function : "astar_sp" and "shortest_path_astar" ? Do you think the query's result from both of them is same or different?
14
votes
2answers
423 views

Is there any open-source object-oriented GIS?

Most GIS are layer based. But I am looking for open-source object-oriented GIS. Is there any out there? By object-oriented I mean logical data model for vector GIS. Here's explanation of my ...
2
votes
0answers
155 views

How to change tooltip of an esriControl?

Is there a way to change an esriControl's tooltip? I tried using the ICommand interface but the tooltip propertry is read-only. If I have to build a whole new ICommand and/or ITool is there anyway ...
4
votes
1answer
2k views

How to create a Digital Elevation Model

How to create a DEM starting from layers shapefile "contour lines" and "shares"? which module of GRASS I need to use? thanks for yours responses....
0
votes
1answer
22 views

How do I add “padding” to features when applying d.out.file to map display on GRASS?

Thing is this. I've done up a script to automate some spatial interpolation and eventually output the interpolated raster and contour lines as an image of the map display. I'm doing this using ...
13
votes
4answers
4k views

How to place elevation numbers on contours with uphill orientation and position?

I want to orient my elevation labels uphill. Is that possible? I'm currently using the labeling tool from QGIS (not that one in layer settings). I want the labels curved and uphill oriented (and I ...
5
votes
3answers
2k views

How to generate colorful images using GDAL?

I am using gdal_translate -of JPEG -scale -co worldfile=yes ndvi.tiff output.jpg command to convert tiff images to jpg and resize it. But it generates only black and white images. How can I generate ...
3
votes
2answers
974 views

How to study qgis generated tiff images for water flow/resources ?

I am new to qgis. I have created tiff images from modis data using qgis. I want to study the water flow/resources from those images. As I am new to this field I don't understand how to study those ...
4
votes
2answers
1k views

GEOS Python: Taking Union of several geometries

I am using the GEOS/OGR library in Python. I have files full of geometries that overlap, and I want to convert these to files of geometries that don't overlap. The way I have been approaching this ...
1
vote
1answer
2k views

How to create an ArcObjects point with latitude and longitude?

I need to add a point in an existing feature class using .NET API of ArcGIS Server 10 in C# (Visual Studio 2008). I'm using a sample from ESRI Resource Center (ArcGIS_SimpleEdit_CSharp). The following ...
6
votes
1answer
629 views

Using python, how do you “reload cache” an opened Attribute Table

Used python to update a shapeFile through cursors. The Shapefile is updated, but there could be an opened Attribute Table. Manually you can hit "reload cache" to update the Attribute Table and see ...
5
votes
1answer
1k views

Waiting for Python script tool to complete in ModelBuilder?

I have an Arcgis (10) model which has 2 process that need to be run sequentially. The 1st process is a python script that creates multiple rasters, but that output is not known to ModelBuilder, ...
6
votes
0answers
547 views

Map is missing when I “export as image” via print composer [closed]

I have point data on a vector layer that prints accurately via print composer (when I "export as image"), however my map below either does not show up or shows up at an incorrect scale. I used ...
4
votes
2answers
1k views

How do you make map styles NOT appear in a legend?

I am using GeoServer to serve up OSM data. I am making use of the GetLegendGraphic command, but I do not want some of my styles to appear in the legend (for example, the styles that are ONLY for text ...
4
votes
1answer
313 views

Google Earth/Maps aerials via arc2earth producing cuts in PDF output

I just purchased a month of arc2earth. They provide Google imagery backgrounds with great resolution and display fine in ArcMap but after exporting to PDF they have these triangular cuts as seen here: ...
2
votes
2answers
2k views

QGIS installation error

Translation When QGIS is installed, it displays the following message: the ordinal 3109 could not be located in the dynamic library LIBEAY32.dll. Could someone please help me. Thanks. ...
2
votes
1answer
328 views

Directing output to a mirrored file tree. ArcGIS, Python

I am attempting to modify the Batch Project script to: a) read from a text file of file names located on our server b) build a mirror of the paths to those files on my local machine c) output to my ...
2
votes
2answers
252 views

ESRI ArcGIS Javascript API - any 2.9 beta examples available?

I found the arcgis 2.9 beta at http://servicesbeta.esri.com/jsapi/arcgis/2.9 but cannot find any beta samples. Are they available?
1
vote
1answer
832 views

OpenStreetMap default style for roads

I'm using the OpenStreetMap plugin for QGIS and I've successfully rendered a .osm file (lines). I've tried a few styles from github but so far none of them label all of the streets like the osm ...
1
vote
1answer
96 views

Issues when using geometry in pgrouting

I am trying to use pgrouting to get the shortest path. I executed the shortest_path function and in return I got the set of edges belonging to that shortest path. When I got the geometry for each edge ...
0
votes
2answers
1k views

How to properly install Cartaro GeoCMS?

I have been trying to install Cartaro the drupal GeoCMS for a while without success. I have properly installed Geoserver (running fine), Postgresql and postgis 1.5 enabled but when i try to install ...
15
votes
3answers
10k views

ogr2ogr converting to shapefile - how to select feature types?

Shapefiles can only have one geometry type, but many other formats (kml, geojson) can have multiple types. When converting to shapefiles, is it possible to to tell ogr2ogr to create multiple ...
7
votes
2answers
2k views

Fnding wildcard string using Field Calculator script code?

I'm trying to find part of a text string in the CLASS_NAME field and return a text string to the Abrv_Name field using the Field Calculator in ArcGIS 10 via a Python parser. Here is what I have tried ...
3
votes
2answers
2k views

Batch Dissolve Polygons based on Attributes in QGIS or FWTools

I was wondering if anyone can help with batching a dissolve. I have a few hundred polygon shapefiles that I want to dissolve based on an attribute. I would like to do this in QGIS or FWTools. Any ...
3
votes
1answer
2k views

Unable to change data source path for group layer file

I am having some difficulty changing the data source for a group layer. Below is the code that I am using. It processes a LYR file successfully that has a single data source but if LYR file has more ...
2
votes
1answer
475 views

Temporal coverages dynamically reloaded from data store in GeoServer

I'm pretty new to GeoServer. I would like to serve results of a simulation that concerns geospatial data as a Web Coverage Service (it has to be OGC compliant). The individual steps of the simulation ...
1
vote
3answers
837 views

Looking for high resolution (1m or better) aerials for Turkey?

Would prefer free but under a couple hundred dollars is also doable. It would be nice to have actual tif, sid, etc. files but a WMS would also work. The WMS (bing and esri) I have been able to ...

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