2
votes
0answers
27 views

Classified Images of RandomForest-Classification look clustered

I performed a RF-classification. I have 6 bands, ~250 trainingpoints in a shapefile, OOB estimate of error rate: 1.56% Picture of take trainingpoints added. My code: ...
0
votes
0answers
15 views

How to compile QGIS 2.4.0 on Ubuntu Precise 12.04

Been trying to compile this for a couple of hours, using this download: qgis.org/downloads/qgis-latest.tar.bz2 and these instructions: ...
2
votes
2answers
45 views

Change symbol size in legend for FeatureLayer (ArcGIS API for JavaScript)

I'm learning how to create web applications using the ArcGIS API for JavaScript. I have a map that is displaying both an ArcGISDynamicMapServiceLayer (which includes two layers) and a FeatureLayer. I ...
2
votes
4answers
430 views

Polygons for postcodes in Spain

Is there a source (free or paid) for polygons of border coordinates for spanish postcodes? Google show this borders in google maps, but doesn't provide them.
0
votes
1answer
338 views

how to display the coordinates of a openlayers map with a jquery in my asp.net textbox?

this is my initmap.js OpenLayers.Control.Click = OpenLayers.Class(OpenLayers.Control, { defaultHandlerOptions: { }, initialize: function (options) { this.handlerOptions = ...
6
votes
3answers
237 views

Average frequency of zip code change for a given address over the course of year

This is a difficult question to answer with a high degree of accuracy, but could someone estimate to within an order of magnitude for me the chances of a zip code for a given address changing over the ...
0
votes
1answer
44 views

Looping through subsets and spatial-join to single output

I have two feature class files, point file and polyline file and would like to spatially join pairs by looping/iterating based on a conditional IF statement. The resulting pairs would then be loaded ...
1
vote
1answer
27 views

Deleting unconnected lines qgis

I am using a roads map in shapefile format in order to calculate a route between two points. The map is downloaded from openstreetmaps and it has small unconnected lines that are messing up my ...
4
votes
2answers
54 views

QGIS 2.4.0 How to display only selected features on map?

Not sure if this option ever existed, but the new QGIS version hides a lot of things somewhere else and this seems so simple that I'm kind of convinced it was possible to do this before. I have quite ...
1
vote
0answers
16 views

How can I associate a consistent polygon area with a set of attributes using a topology?

Consider the following topology. SELECT CreateTopology('topotestschema', 0, 0.01); CREATE TABLE topotest (id SERIAL PRIMARY KEY, data TEXT); SELECT AddTopoGeometryColumn('topotestschema', 'public', ...
6
votes
1answer
99 views

How to create a storm swath map?

I can't really find the words to explain what I'd like to achieve so I attached a picture. The top picture was made of two layers, the layer with circles was made/styled using the instructions from ...
3
votes
2answers
50 views

Buffer multiple roads to find points within and compare?

What I am trying to do is buffer a main st and a side street and get all of the points that intersect that buffer, however they need to be mutually exclusive. In the example below, my results would ...
3
votes
1answer
208 views

1944 Cyprus Grid coordinate data projection problem in MapInfo

I have coordinate data from the 1944 British Army General Staff, Geographical Section (GSGS) Cyprus map which was cast on the Cassini projection, but was referenced to the Clarke 1880 ellipsoid where ...
0
votes
0answers
41 views

Is there a way to force a featureclass to prevent the creation of non-simple shapes when using native geometry storage?

After spending a good chunk of the morning trying to figure out why a feature was displaying a circle when I was setting it as a rectangle polygon via SQL, I found the SDE_GEOMETRY table and some ...
6
votes
4answers
472 views

Is there a universal map/ layer format?

Just wondering if there is a universal map format that all GIS software can read. ie to quickly share layers with all our partner agencies which have different GIS Software, rather than have to ...
4
votes
3answers
60 views

From PostgreSQL to QGIS

I have conected to PostgreSQL and imported the layer to QGIS. The names of columns are written using English letters. Can the names of columns be automatically renamed using another language?
4
votes
3answers
48 views

ArcObjects : How to identify ITool.OnMouseUp method execution

In ArcMap, I have a tool that inherits BaseCommand. The tool enables the user to draw a graphic on the screen. I activated this tool (set as current tool) from a Windows UserForm by getting its ...
1
vote
1answer
783 views

Using Dijkstra's algorithm for multiple source to single destination shortest paths

I'm going over a lecture recording, in it my professor mentions using Dijkstra's algorithm (or a modified version of it) to find multiple-source to single source shortest paths, e.g. finding the ...
1
vote
1answer
12 views

Leaflet HTTP.Get bad request; not loading tiles

I am trying to walk through the Leaflet quick start tutorial and am having a really simple issue: None of my tiles are loading. I get this error at the image url and an HTTP Bad Request in the ...
1
vote
1answer
97 views

QGIS 2.2 Raster Merge losing color data

I'm trying to merge a couple of GeoTiff maps using Raster > Miscellaneous > Merge but the merge is only coming out in grayscale. The geotifs are using palettes color. How do I get the merge to keep ...
4
votes
2answers
75 views

Feature not added to KML Vector Layer in Firefox

UPDATE simplified with JSFiddle example: here is the most simplistic JSFiddle showing what I mean: http://jsfiddle.net/eflowbeach/75eq1mqe/ You can see in Chrome and IE that the feature appears, in ...
1
vote
1answer
35 views

Query to find all lines connected to other

I have problem with one spatial (Oracle) query. Simplified overview of the problem is: I have two tables: CREATE TABLE thin_lines ( id NUMBER PRIMARY KEY, geom SDO_GEOMETRY), color ...
2
votes
1answer
20 views

Data defines symbology in QGIS

I have to make a symbology based on a unique color value so I add a plus column to the attribute table with the number of color values. I went to the layer properties - style - data defined properties ...
4
votes
2answers
2k views

Can POSTGIS 2.0 be install with POSTGRES 9.2 on Ubuntu 12.04 OS at the moment?

This question is more about environment set up. At the current moment, March 4th 2013, can POSTGIS2.0 be install with POSTGRES 9.2? I check their website out and to my understanding it is not ...
1
vote
1answer
236 views

How to convert 4-channel PNG files to grayscale geoTIFFs?

I suspect that there exists a gdal tool (gdal_translate?) that will convert a 4-channel PNG (+ world file) to a 1-channel (gray-scale) geoTIFF. From the gdal_translate man page, it appears simple to ...
3
votes
2answers
5k views

How to install PostgreSQL 9.2 with PostGIS 2.0 on Ubuntu 11.10 (or higher)?

I have read this question: Install PostGIS v2 for PostgreSQL v9.2, but it didn't resolve my problem. I added the PostgreSQL backports PPA and installed the postgresql-9.2 package, but there is no ...
1
vote
2answers
26 views

How to extend grid lines (Survey traverse lines) created by vector grid tool in QGIS?

We have a polygon. We want to create a grid (sort of) with certain intervals, lets just say - 200ms. In QGIS, using "Vector grid" option we can do this. But, once it's get clipped, it's like Fig -1. ...
0
votes
0answers
31 views

How to calculate the Azimuth between two points in PostGIS?

I have a GIS API based on OpenLayers. I have been trying to implement Azimuth calculation in JavaScript and I needed some way to calculate the Azimuth in order to perform tests. I started using ...
1
vote
0answers
6 views

CartoDB, add search box after cartodb.createLayer

I used to use a hack I found online to add a search box to a cartoDB map, which I created using cartodb.createLayer and it used to work, but now it stopped working, the search box does not appear (no ...
2
votes
1answer
29 views

Combining edits from multiple Geodatabases into a Master Geodatabase

Is there a way to automate combining edits from multiple, single project geodatabases into a master geodatabase based off the date the edits were made without creating duplicated of the same project ...
2
votes
0answers
17 views

Spatial Join Attribution for Report Generation

I generated a grid index for a very large area of land in order to create a mapbook to keep track of some environmental sites for monitoring. I was able to generate the pages of maps without issue, ...
1
vote
0answers
20 views

Time not configuring correctly?

I'm trying to match data in a textfile that contains time, value, and fips code to the cntyidfp part of a map of US counties. However, even though I am able to match the two sets of data together, ...
1
vote
2answers
604 views

OpenLayers vector does not draw (or re-draw) on zoom level change or layerswitcher off/on

Here is the full code (i'll highlight the important parts after): jQuery(document).ready(function($) { // ...
0
votes
1answer
11 views

Road displays up to node, not up to starting point and ending point

SELECT id FROM table ORDER BY st_distance(the_geom, st_setsrid(st_makepoint($slng,$slat), 4326)) limit 1 ; get source and similar for target ; and then apply in dijkstra algo SELECT pgr_a('SELECT id ...
1
vote
0answers
23 views

QGIS polygon areas inside a polygon

I'm having hard time doing the following analysis in QGIS: I have watershed polygons with individual IDs. Then I have four different shape files, each having different land use polygons. I would ...
4
votes
1answer
89 views

What is an efficient Algorithm to draw a straight line from points?

I have some cross section survey data, which is like this: X Y Z pt_dt 2970969.635 359725.0088 83.4242 1-x 2970968.278 359722.2182 83.2591 1-x 2970941.771 359670.127 83.0655 1-x 2970961.369 ...
0
votes
0answers
16 views

QGIS plugin for geodesy tasks [on hold]

Are there any plugins in QGIS for solution of geodetic problems, construct serif?
1
vote
0answers
12 views

How to Interpolate very large datasets in QGIS

I am working with a very large set of point data, (XYAttribute) which I wish to display as a raster. I've been using Interpolate, this is successful but very slow. I have other programmes that simply ...
2
votes
0answers
18 views

Performing buffering and intersection with script in PyQGIS

I wrote a script that performs the intersection of two layers: The first Layer -> layer1, represents the rivers The second Layer -> layer2, represents a set of circular dots distributed in a ...
1
vote
0answers
24 views

Clipping between features within a single vector?

Is it possible (via the Qgis API and friends), to clip polygonal features within a single vector layer? The hope is to accomplish this without having to duplicate the feature into a new layer. ...
1
vote
1answer
87 views

Tile Index in Qgis Web Client

I have a many aerial photos. I created a tile_index with gdaltindex. Now I would like to display the aerial photos of the tile_index in qgis-web-client. How can I do that? Is there somewhere a ...
1
vote
1answer
78 views

Rf-Classification seems to work but gives an error 15 seconds later

This is my code. It classifies an imagery-stack(xvars) and reads a shapefile with training-points. If I run single rows they work. Even if I run them all, they work and start to predict but after 15s ...
0
votes
0answers
49 views

Error: .asc is not a supported raster data source

I am new using QGIS and struggling with this error "...... .asc is not a supported raster data source" when trying to add a ."asc" file as a raster. I downloaded the files from ...
1
vote
1answer
28 views

Combining multiple year yield data in ArcGIS for Desktop?

I am using ArcGIS 10.1 for Desktop and trying to find the simplest way to combine multiple year of crops yield data into one file and get the average yield. The files are point files from a yield ...
1
vote
0answers
12 views

How to create Strips with GCP point distribution for raw GeoEye satellite imagery?

I have raw GeoEye satellite imagery, I just want some guidelines for creating a strip map with GCP distribution. We need to make orthorectification for raw GeoEye satellite imagery, I think it's ...
2
votes
0answers
29 views

Create circles around a point on a map measuring the radius in hours

Disclaimer: I am not experienced in GIS and hope this question fits in this category. I was wondering whether it is somehow possible to create a circle* around a city, using Google Maps or the like, ...
0
votes
0answers
7 views

UTFGrid from raster source

Is it possible to make utfgrids from a raster source (e.g. GeoTIFF)? I am trying to get utfgrids from a .tif with mapnik.xml and TileStache but it seems not to be working. As a workaround I am ...
2
votes
3answers
52 views

How to measure correct distances in a project with OpenLayers background?

I have 3 lat/long points as follows: A = {35.257246,139.721256} B = {35.256541,139.721491} C = {35.256326,139.7203271} 1) Measurement result by Movable Type Scripts: By using the distance ...
40
votes
15answers
6k views

Where can I find QGIS tutorials and resources?

After several recommendations, I thought I'd familiarize myself with the capabilities of QGIS. I downloaded the program, but apart from basic loading of data, I got lost (the help file wasn't much ...
3
votes
1answer
373 views

Plotting multiple addresses with distance to specific POI

I'm not sure if this is the correct place for this question but here goes. I am getting ready to move to a different city. Right now I have about 80 houses to choose from. One of my parameters for ...

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