22
votes
8answers
2k views

Value of a Python programming course

I am considering upping my programming skills by taking a python geoprocessing course through ESRI. Before I part with the hefty registration fee, I would like to get your opinion on the value of 24 ...
3
votes
1answer
490 views

How to access the icon of a feature retrieved from text in a vector-layer?

I`m using OpenLayers to show POIs on a map. These POIs are loaded from a textfile and I`m using a Vector Layer to get it onto the map - works great. Now I want to use the cluster strategy to have ...
0
votes
0answers
199 views

Installation does not work

I tried to install QGis on my computer (Windows XP Professional) but it does not work at all. I do get the installation wizzard and I can complete that, but nothing happens. After completion, the ...
10
votes
3answers
4k views

How can I mosaic images in ArcMap without it affecting the colour?

This is 4 images (NE, SE, NW, SW) sections of imagery. They have some overlap between them. Working with 1m 3-band orthoimagery. Different parts are sometime flown at different times/sources hence ...
4
votes
3answers
2k views

Viewshed Analysis With GDAL

I am looking to perform a simple (one observer location) viewshed analysis on a standard DEM using GDAL (either python or .NET bindings). I have searched, but haven't found any readily available ...
2
votes
0answers
226 views

Polygons of Land Use Change

I am doing a project where I am digitizing a map of Haiti from the 70s. Through R2V I digitized the lines and then I exported it into ArcGIS 10. I am just interested in the land use change, therefore, ...
8
votes
3answers
514 views

Using ESRI geoprocessing services from a non-ESRI client (Python)?

I'm thinking it should be possible to consume an ESRI Geoprocessing service from a python script without invoking ArcPy or needing an ESRI installation on the client machine. For example I create a ...
2
votes
1answer
2k views

Unable to see whole world map by decreasing panzoom bar?

I am seeing one weird thing in Openlayers today. I am unable to see whole map by using panzoombar, previously i used to. <html> <head> <title>OpenLayers Example</title> ...
4
votes
1answer
2k views

Add multiple fields in attribute table

How do I add in multiple fields in the attribute table? In the attribute table I have crop types such as corn, cotton, sorghum....etc (as shown image below), in square meters. and I want to generate ...
2
votes
1answer
101 views

Need software to read geo information from tif

I am trying to verify the lat/lon and ECEF values that I have determined for a very specific and unusual situation (a geotif file), and it would be great if I could find some software to read them. ...
1
vote
1answer
1k views

SImple model works, resulting script doesn't

The goal is to convert an XY layer (from Excel) into a feature class. The "MakeXY" portion works flawlessly, the arcpy.FeatureClassToFeatureClass_conversion portion inevitably returns a 999999 "Table ...
3
votes
1answer
371 views

Crop collar from chart

I need advice on how to complete the following task: I have aeronautical charts covering parts of the US (example: http://aeronav.faa.gov/content/aeronav/sectional_files/Albuquerque_89.zip - Each ...
3
votes
2answers
66 views

Where to look for oceanographical/environmental data for the Arctic (Baffin Bay/Davis Strait area)

I am looking for oceanographical/environmental variables that are available for Baffin Bay/Davis Strait area over the time period of 1995-2011, however, I am not familiar with ...
6
votes
1answer
621 views

Apportioning Points at a street intersection (arcgis or mapinfo)

I can't seem to find any evidence of this question, but I'm surprised by that, so pardon if this has been asked. If one is mapping crime location reports, by XY coordinates to streets, to create ...
6
votes
5answers
15k views

Trouble when georeferencing CAD files in ArcMap

I've definitely got at least a couple of grey hairs while trying to convert some dwg. files to shapefiles. I've seen that this subject has been disscused a lot, but hope someone will have the ...
3
votes
1answer
2k views

How to send WPS request using OpenLayers

I have generated the WPS request below using GeoServer's WPS Request Builder. I wish to append more parameters to this request (geometry selection), and then send it either using GET or POST from ...
2
votes
2answers
325 views

Determine the furthest driving distance from a road layer to the nearest point of a point layer using OSM/QGIS

In a specific geographic area, I have a road layer and roughly 30 points dispersed around the geographic area as part of a point layer. Both layers are in SHP and PostGIS formats. The records from the ...
1
vote
2answers
577 views

Openlayers controls outside the map

I want put OpenLayers controls outside a map but dont know how. I find this example http://openlayers.org/dev/examples/editingtoolbar-outside.html but its not what i want. I have a button and want ...
5
votes
1answer
395 views

Is there a parellel line function for slds?

I am attempting to make an sld style which symbolizes a line with an offset. I have tried with filters, functions online graphics but can achieve only ugly results. The line consists out of 2 line ...
4
votes
3answers
3k views

Selecting MAX values within records with the same name

I'm working in ArcMap 9.3 and I've never dealt with that kind of queries... I need to Select the MAX value from column [A] for each set of records in the table which have the same value in column [B] ...
2
votes
3answers
3k views

Change zIndex of Vectors in openlayers

I have a bunch of linestring features on a vector layer. Some of them overlap. If I trigger the hover event on those features, I want them be in front. I did find some functions to set the z-index of ...
1
vote
1answer
570 views

how can i use flat buffer for polygon?

i'd like to create flat buffer in a polygon shapefile .i try to use buffer tool in ArcGIS 9.3 but i could'nt select "flat" option in endtype combobox because the input feature is polygon .how can i ...
1
vote
0answers
128 views

Get GPS way points to exact place

I added some GPS way points on land use layer. but way points are not in exact place.(Way points are located at little bit away from exact place) I want to adjust way points to exact place. GPS was ...
5
votes
1answer
426 views

BigInt data type in SQL Server mapped as Text in ArcMap

I have a table in a SQL Server 2008 database containing a BIGINT data column. When I tried to import it into ArcMap 10, it automatically converted as Text of 8 length. This caused the records that ...
12
votes
2answers
4k views

How to concatenate labels in QGIS?

I'm using QGIS 1.8 on windows XP machine and I try to do a concatenation of several fields to label the names of my local roads in the attribute table, but I can not find the correct syntax. The first ...
1
vote
2answers
1k views

How to make WFS layer with GeoExt?

Can u help me with WFS on GEOExt? Im read tutorial and see this code. proxy: new GeoExt.data.ProtocolProxy({ protocol: new OpenLayers.Protocol.WFS({ url: "/geoserver/ows", ...
8
votes
1answer
139 views

How to improve the display of color images?

I've found some really nice color ramps for portraying rasters, but in ArcGIS and QGIS, they don't seem to be easily usable for a finished product because their complexity causes obvious steps rather ...
2
votes
1answer
922 views

Creating dynamic attribute table column measuring distance from center of extent to points in layer?

We are developing a property look up tool for environmental hazards/chemical spills. In layout view we have a circular data extent with a graphic of a target house in the center and some proportional ...
3
votes
2answers
1k views

How should I go about calculating the centroid of several lat long points in python, and perl?

Calculating the centroid several time on a number of geographical points. I was wonder is there a perl or python module that could make my life easier when working with large datasets of lat long ...
1
vote
0answers
83 views

Attachment Editor in XSL

I'm trying to create a custom HTML Popup using XSL. I can get the attachment JPEG's to show, but cannot seem to integrate the Attachment Manager that you can find when setting the HTML Popup As a ...
1
vote
2answers
172 views

postgis st_geomfromgml error on point

In PostGIS 2.0 I try: select ST_GeomFromGML( '<gml:Point srsName="urn:ogc:def:crs:EPSG::28992"> <gml:pos>275466.0 565559.0 0.0</gml:pos> </gml:Point>'); This ...
2
votes
1answer
356 views

Is there a way to route different vehicles within OSM2PO?

Is there a way to route different vehicles within OSM2PO? I would like to start the service with a config file and then turn different flags on/off depending on whether the route is for a bike or a ...
2
votes
2answers
316 views

Unable to open QGIS after Installation [closed]

I have a Windows Vista (32 bit) computer. I tried installing and reinstalling (by uninstalling the software first) QGIS 1.8 a few time then went to version 1.7.4 and still encountering the same ...
18
votes
4answers
17k views

Creating square buffer around point feature using ArcGIS for Desktop?

I would like to create a square buffer from a point feature but I do not understand the code that goes into it. Similar questions have been asked on the forums.esri website but that was over 10 ...
3
votes
1answer
3k views

Creating a multiple bar graph in ArcMap

I would like to graph my data from a shapefile. The data I wish to display is the sum of the nominal data per each year that it occurred. I have enclosed a screenshot to illustrate my idea. There is ...
5
votes
2answers
289 views

Numbering Watersheds using ArcGIS Desktop?

I am working with a watershed map, and I was wondering if there is a function or a way that I can get ArcMap to number the watersheds. For instance, if we have watershed X numbered as 0, I want the ...
7
votes
1answer
130 views

Finding similar trips in a database

I have a trips table and a bus_stops table. The trips table has a from_stop_id and a to_stop_id. The bus_stops table has lat and lng information for each bus stop. How can I order the trips in ...
2
votes
1answer
595 views

Creating a constant elevation raster with multiple attributes

Is it possible to create a raster with a constant value with multiple attributes? Such as: rowid value count Name 1 630 36000 Forest 2 630 75000 Anthro 3 630 2600 ...
1
vote
2answers
2k views

Adding new field in ArcMap from data of existing field?

I want to create a new field with years data. There is an existing field with the timestamp YYYYMMDDHHMM but I just want the years from that field to the new field. That way I can display just the ...
5
votes
2answers
335 views

ToolValidator not doing anything

I have created a simple script tool which has a single parameter of type "String". I have written the tool validation to disable the input field (simply trying to learn tool validation). The ...
1
vote
1answer
530 views

postgis st_linemerge based on attribute

I have a postgis table full of very small line segments. I would like to merge them according to an attribute in another field. update line_table set the_geom = ST_LineMerge(the_geom); but how do I ...
2
votes
1answer
273 views

Creating a model to run a complex query

I'm just a rookie when it comes to creating models in ArcGIS. I have two shapefiles from which I need to calculate an AVG and a MAX erosion rate for individual properties. The two shapefiles are: ...
2
votes
1answer
638 views

ArcGIS: How to programmatically refresh selected features

Background: I have C#, ArcGIS command that 1. lists selected features, and 2. allows you to delete selected features from this list out of a geodatabase. My problem: After I delete features, ArcGIS ...
1
vote
1answer
747 views

openlayers trigger hover event

I have a bunch of tracks on screen in a vector layer. I used some hover and select styles in the layer styleMap and these styles are properly triggered by: var highlightCtrl = new ...
1
vote
0answers
206 views

About the shortest path returned by pgrouting

I have a couple of questions related to the shortest path returned by pgrouting. I have this result for example. edge_id cost reverse_cost x1 y1 x2 y2 1 ...
1
vote
1answer
235 views

TileCache SVN trunk on IIS 7 - An error occurred: No section: 'cache'

I was having tile generation problems with TileCache 2.11 and decided to update to the trunk. I repeated the instructions necessary to get TileCache working in IIS but now I'm seeing this error: An ...
1
vote
1answer
268 views

Node Visibility Within Layer

Is there a way within QGIS to hide/display (freeze/thaw) an individual node feature within a layer or does this control only exist at the layer level.
1
vote
0answers
130 views

Graph of a specific area of USA

I am trying to get the network graph of a specific reason of USA. I have got a couple of options. One of them is using osm2po tool to extract the nodes and edge table from the osm map of a specific ...
4
votes
3answers
1k views

Is there any way to add a google maps layer in a qgis web client project?

Is there any way to add a google maps layer in a qgis web client project? I made a qgis project using a google maps layer from OpenLayers Plugin. In my desktop project, this layer works fine. But ...
1
vote
1answer
791 views

How to get a signal when the geometry to a line in QGIS is changed

I am working on a plugin in QGIS and want to get a signal when the geometry to a feature(in this case a polyline) in my layer is changed. For example if I use the node tool to drag one of the nodes. ...

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