A coordinate-based data model that represents geographic features as points, lines, and polygons.
2
votes
0answers
114 views
Overlay Shapefile onto Geotiff
I have a Geotiff map and I want to overlay a Shapefile onto it. Ideally I want to specify a 'nice' style for the polygons e.g. have them opaque (for now all polygons should be the same).
I want to ...
2
votes
0answers
890 views
How to deactive Vector Selection In OpenLayers wms features
This is my sample code and work fine :), But I have a little problem,
I'm using multiple layer (WMS), when I zooming the layer will be shown or hidden.
In my example bellow when OpenLayers level zoom ...
2
votes
0answers
243 views
Creating a sidewalk map for a walkability survey
If I wanted to do my own walkability survey of my city, what tools could I use? I have map data from OpenStreetMap, but I have to consider that streets have two sides (which aren't always accessible ...
2
votes
0answers
859 views
Extract parcel layers from vector pdf
So, I have an interesting problem... I have a PDF file which has over 100 pages and each of these pages is displaying a map in vector format.
By using some third party program I was able to find out ...
1
vote
4answers
225 views
Looking for compute intensive GIS vector operations
I am looking to make efficient algorithms for those vector GIS operation that take a long time for GIS software like Arc-GIS, Grass etc. I have considered polygon overlay but looking for other ...
1
vote
2answers
226 views
Why is my shapefile not visible in Tilemill?
I have 3 layers of vectors (shapefiles) that I've loaded into Tilemill. However, nothing is visible in Tilemill. What am I doing wrong, and what should I do to get my map to show up?
This is part ...
1
vote
2answers
85 views
How to join polygons and lines vector maps from openstreetmap?
I am struggling with the data format OSM gives me: I want to use OSM data for routing, but all round-abouts and parking lots are not in the lines layer. They are situated in the poly(lines) layer.
...
1
vote
2answers
135 views
How to select only areas bigger than x acres?
I would like to create a new shapefile from another area shapefile. The new shapefile should only contain all areas that are bigger than 5 acres (10.000 m²).
How do I do this?
1
vote
2answers
1k views
How to set cell size for vector to raster conversion in QGIS GRASS plugin?
I'm converting a vector (loaded in GRASS plugin in QGIS (1.7.0.-wroclaw) and would like to convert this to a raster with a defined cell size. At the same time I need a value from the attribute tabel ...
1
vote
1answer
170 views
Why is the geonames not loading?
I want to import a geonames file. I downloaded the geonames .txt file from http://download.geonames.org/export/dump/
I used:
v.in.geonames input=PH.txt output=ph
but it displayed ...
1
vote
1answer
1k views
How to combine a vector and a raster file?
I want to combine a raster and a vector file. After combining, can I query on the resulting map to obtain a specific area? How?
1
vote
2answers
365 views
Is it required to use BBOX strategy with WFS protocol in OpenLayers?
is it a must to use BBOX strategy with WFS protocol in Vector layers ?
I cannot display this layer without BBOX strategy:
vLayer = new OpenLayers.Layer.Vector("Test", {
styleMap: new ...
1
vote
3answers
1k views
What is the problem with the merge shapefiles tool in QGIS?
I'm having trouble merging shapefiles in QGIS. I'm using plugin ftools 0.6.1 and I get this:
Any workarounds someone may know of?
Thanks
1
vote
2answers
610 views
Tools/processes that avoid the need for raster to vector converstion?
A "brute force" method of solving GIS problems that involve acquiring values from raster cells and storing them on spatially overlapping vector features is to first convert the raster to a vector. The ...
1
vote
1answer
700 views
How to select a raster file that is under a polygon in a vector file?
I am using:
v.db.select map=PHL_adm1 where=NAME_1='Bulacan'
My vector map is over the raster map. I want to select the part of the raster map under the polygon(NAME_1='Bulacan') of a vector. Is it ...
1
vote
2answers
79 views
How to create Concentric Circles in QGIS?
I'm trying to build a planning tool for center pivot irrigation system. It involves selecting a field (polygon), a center point, and then an outer circle to set the outer limits of the system. From ...
1
vote
1answer
83 views
Split vector layer by field name
I have a vector layer of 108374 lines I want to split the vector layer into field names of the layer, which is 17. Now, I want to create a new vector layer containing one of the field names e.g. ...
1
vote
2answers
290 views
Openlayers remove previously drawn polygon on starting to draw next one
Objective:
At any point of time there SHOULD only be zero/one polygon(s) on a vector layer with a polygon control. I need the previous polygon to be removed as soon as user starts drawing the first ...
1
vote
1answer
202 views
Intersection between two SpatialPolygonsDataFrame using gIntersection function in R
I want to select a subset of my map (a SpatialPolygonsDataFrame) to create a new vector map = part of the initial map included inside a given polygon (eventually, inside several polygons).
I have a ...
1
vote
2answers
372 views
How to show vector features in OpenLayers after hiding it?
I did change some vector features style (through check-boxes) using style property :
var features = layer.features;
for( var i = 0; i < features.length; i++ ) {
//features[i].style = { ...
1
vote
2answers
199 views
How to print a vector layer over Google map? “Physical Printing”
I use Geoserver, Openlayers, Extjs and GeoExt to build an app.
I am trying to get vector layer on Google map printed with pop up a Print dialog, I tried :
var targetElement = Ext.getCmp('mapPanel');
...
1
vote
1answer
313 views
How to reproject vector datasets in ArcMap?
I want to change one Personal Geo-database projection to another. Kindly give me instructions to re-project vector data.
1
vote
2answers
1k views
Some Help to select some features from a vector layer
I have a vector layer (kml) that has some point with scientific name of plants and animals, some description of the place where the people saw them and the coordinates.
Basically the table associated ...
1
vote
2answers
291 views
Can you reorder a classified vector layer in QGis?
I have a GML file that I'm displaying in QGis - it contains a set of contours and they are written out in such a way that the lowest contour (largest polygon) is drawn last thus covering up all the ...
1
vote
1answer
179 views
Any freely available vector data in cylindrical projection?
I'm trying to develop an application in PHP to plot various points in Europe from a database, and serve them dynamically on a map.
I think this should be relatively straightforward when using a map ...
1
vote
1answer
29 views
GRASS: shift point locations in a random direction
I have a vector map that contains 100 points. For each point, I would like to shift it 250 units in a random location. It's easy enough to shift all points in a specified direction using
v.edit ...
1
vote
1answer
82 views
How to invert polygons (or other options for exterior styling)?
I have a shapefile containing many polygons that I want to use to mask a raster. I have tried gdalwarp -cutline <shapefile> -crop_to_cutline -srcnodata -9999 -dstnodata -9999 ...
1
vote
1answer
80 views
How to convert a shapefile polygon to raster in C#
Does anybody know a way to convert a polygon (vector) in a shapefile to raster data WITHOUT using ArcGIS Explorer Desktop? Is there a way to do this 'progmatically' in C# (WPF with ArcGIS runtime ...
1
vote
1answer
89 views
How to reproject this vector layer?
I have a dxf file and use this tool to convert it to shapefile.
Then I apply some affine transformations and get a shapefile that does not fit the shapefiles downloaded from osm (EPSG:4326).
I know ...
1
vote
1answer
157 views
Illustrator to QGIS workflow for vectors
I vectorized a map in Illustrator and would like to import it to QGIS now. I know I must use DXF for that purpose but when I convert the DXF to SHP with the QGIS plugin it is not georeferenced which ...
1
vote
1answer
52 views
How to abort a layer event in Openlayers
I have a problem ( How to stop features to redraw unwillingly in OpenLayers ) that might be solved by aborting the beforefeatureremoved or beforefeaturesremoved event.
What I would like to to is to ...
1
vote
1answer
72 views
Vector title attribute can't display?
var vectormap = new OpenLayers.Layer.Vector('Overlay',
{
styleMap: new OpenLayers.StyleMap(
{
"default": new OpenLayers.Style({
...
1
vote
1answer
57 views
How do I create rendered vector field in qgis
Perhaps I am misunderstanding the "vector field renderer" and "VectFieldCalc" plugins, but I have no idea how to make a vector field of arrows, with directions and magnitude. I have the data loaded ...
1
vote
1answer
72 views
Set certain amount of pixels to 1 inside of a polygon (GRASS)
I have a rather coarse vector map with polygons and want to calculate a (sufficiently) finer raster map defined by spatial extension and resolution. Every polygon of the vector map has a value ...
1
vote
1answer
305 views
QGIS : 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 ...
1
vote
1answer
189 views
Openlayers - Vector Layer - Combining hide/show features using style property
I am trying to filter vector layer features according to their attributes. I have 4 check boxes: type_1, type_2, shape_1 and shape_2 Note that I am using Extjs for interface.
at beginning I could ...
1
vote
1answer
82 views
Are There Any OpenSource GIS Software Programs With an “Interactive” Rotate Feature Option?
![Rotate feature option][1]Sorry if the question is too simple, but are there any open source GIS software programs available with an interactive "Rotate vector feature" option?
Eg : ArcGIS has it ...
1
vote
1answer
64 views
How to extend lines in Grass
I have a set of vector lines in grass which I need to convert into polygons. However, because of bad base data, the polygons don't always close. To fix this, I need to extend each disjointed line by ...
1
vote
1answer
591 views
OpenLayers : How to make a marker fixed [duplicate]
Possible Duplicate:
How to skip drag event to stop a feature being dragged
I've created a map and added markers to baselayer on click by using this code :
vectorLayer = new ...
1
vote
1answer
304 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
2answers
193 views
Its possible to catch ServiceException in Openlayers?
Im trying to catch exception in OpenLayers using vector layers in conjunction with http protocol, its possible to intercept an ServiceException from geoserver ... it will be great to display some ...
1
vote
1answer
132 views
v.dissolve renames the attribute table column and does not produce a dbf
When I run v.dissolve on my vector...
v.dissolve --o input=pass2@mapset1 layer=1 column=fttcp output=pass3
The dissolving appears to work but the column name in the attribute table has changed from ...
1
vote
1answer
349 views
Splitting lines at a specified distance
Does exist some plugin with it is possible to Splitting lines at a specified distance in Qgis?
1
vote
1answer
160 views
Why are layers not lining up with others with the same CRS? [closed]
I am creating a project on the UK and have downloaded various shapefiles. When I add a vector layer they are coming up as if they are not lining up. Some layers are nicely on top of each other with ...
1
vote
1answer
80 views
How to reference vector based data to raster data that already has spatial reference in MAPublisher?
I have been able to load in raster data into MAPublisher and properly registered it, however I have been having trouble with a further step. I am trying to reference vector data that has no GCS or ...
1
vote
1answer
32 views
Display list of OpenLayers Features which are currently visible on screen
I have an OpenLayers map a few thousand Points of Interest. These POIs are Vector Features rendered in a Vector Layer.
We are loading the POIs once in order to minimize load on the server.
Next to ...
1
vote
0answers
39 views
Base station coverage analysis in QGIS
I want to find base station coverage for a instant location. I have building data. And i determine optimum coverage as 500m far away from a base station (buffer). So how can i find optimum base ...
1
vote
0answers
42 views
Looking for best practice to connect multiple road vector line layers for routing (pgRouting) purposes
The Data I have:
Bridges (line layer)
Municipal_roads (line layer and does not include information in Bridges)
State_roads (line layer that doesn't include Municipal_roads or Bridges)
Question:
...
1
vote
1answer
75 views
Is it possible to fix a vector layer after I badly georeferenced a map? [duplicate]
Sorry in advance if I missed another question on this topic. I searched for everything I could think of, but I didn't find anything with a solution to my problem.
I am quite new to GIS tools and ...
1
vote
0answers
37 views
Spatial adjustment for vector shp files in QGIS [duplicate]
How to do spatial adjustment for vector shp files in QGIS?
I have a set of 4 cadastral maps of adjacent locations. I have converted them form DWG to DXF and then to vector shapefiles. They are not ...
