A coordinate-based data model that represents geographic features as points, lines, and polygons.
2
votes
2answers
22 views
Converted GPX file has null values in open attributes
I'm an absolute newbie but I think I'm doing this right.
I've got a bunch of .fit files from my garmin. I can use GPSBabel to manually convert these to GPX XML and the map looks fine after the ...
0
votes
1answer
22 views
Get lat/lon points from image pixels
I need to build an application with the following requirement:
shows a map .png picture to user.
then, users select several points around the map (I can get the x/y pixels from each point)
based on ...
1
vote
1answer
23 views
How to indicate flow of a watershed feature?
While tracing and digitizing rivers, streams, rivulets, etc., is it possible to indicate the direction/flow in the shapefile on QGIS?
I'd like to avoid using map labels. Ideally, when done tracing, I ...
1
vote
0answers
25 views
Is there a decent algorithm in QGIS Process Modeller to create a grid?
I am using Process Modeller to automate merging several vector layers and then creating a grid to cover the extent of the merged layer. There are functions which already exist which are not listed in ...
0
votes
1answer
24 views
get and change style property openlayers
i need to change the property of some style after its created, and i need to change it with knowing only the string of the property name.
i am getting string like "fillColor" and value like "blue", ...
1
vote
1answer
39 views
QGIS: Line to polygon conversion
Currently we are working in a geological project..in which all the Contacts, Linear & some other geological features have to be captured.
The thing is most of the features have to be Captured as ...
1
vote
1answer
22 views
How to Warp vector file based on control points in ArcMap?
I have a very comprehensive polyline file that, when compared with imagery, is obviously offset by a few hundred meters, but the offset varies from one area to another. It would be easy for me to ...
0
votes
1answer
31 views
Producing gradients between shapefiles and using original boundarys as isoclines (lines)
to produce a bathmertical map of a river bed I draw shapefiles showing the different depths based on satellite images taken during different tidal levels (deepest, 2nd deepest, 3rd deepest, shore ...
0
votes
1answer
24 views
Rasterization in different bands
I have a set of vector based shape files, representing different types of ground coverage in a city (for ex: roads, buildings, open field,...). For the algorithm that I want to run on it, I need just ...
0
votes
1answer
24 views
Select all features close to clicked
I have an openlayers map with more then 20000 features not in wms, only in vector layer. I have a control to select features, but sometimes it's really hard to select, specially the lines, and also ...
1
vote
2answers
15 views
Adding time stamps to animation slides with OSS tools
I would like to create an animation with time lapse values printed on the PNG file. For this purpose I have created in QGIS a vector layer that stores timestamp and temperature value pairs for various ...
0
votes
0answers
23 views
How to raster vector- and shape-files correctly
does anybody know how to convert vector- and shape-files correctly? Doesn't work with tab Raster/convert/vector to shape files. The output always contains strange input-data (wrong and strange ...
4
votes
0answers
26 views
Projecting polygon when calculating its area? [duplicate]
I have a broad range of polygons (in vector format and in SpatialPolygonsDataFrame class), some going east-west, others going south-north, while even others span polar regions or very large ranges as ...
3
votes
0answers
33 views
Looking for a mobile app for a field campaign with specific spec
In the frame of an international project in agriculture monitoring, I have to propose a mobile app that will be used as a reference for field working. The minimum requirements of such an application ...
0
votes
1answer
33 views
why can't i export geometry data from a shapefile?
I saved the layer using "vector save as" box but even when adding GEOMETRY=AS_XY in the layer box, the csv only showed the id and no gemetry data.
2
votes
1answer
43 views
Why do layers appear in the wrong order in QGIS 2.2?
I have a problem with in which order my vector and raster layers appear in QGIS. I have raster that I want to be the background of my other layers (vector). I place the vector layers on top in the ...
1
vote
2answers
34 views
Techniques for Filtering the Attribute Table in QGIS's Print Composer
For the legend of a trail map I'm working on I'd like to show the trails and their lengths. I have this data in the table. The problem is that not all of the features (lines) have a name or length. ...
1
vote
2answers
32 views
Creating Many Uneven Buffers
Qgis 2.2, Windows 7
I am looking to create buffers around city lights (the raster). Currently, I have simple polygon buffers around the point layer (oecdminusa), but this is not accurately capturing ...
1
vote
0answers
19 views
Calculating Percent Overlap Between Distribution Maps
Hello there,
I am currently trying to calculate the percent overlap (basically the total amount of overlap where these two species come into contact) between Lithobates catesbeiana (first image) ...
4
votes
1answer
110 views
How to add tree height values to raster / vector data?
I am new to working with raster data and I am trying to teach myself a few things. I have what I think is a simple problem but I can't seem to figure this one out after a few hours of searching Arc ...
0
votes
1answer
16 views
vector file is used by two mapsets at a time in grass gis
i want to study about vector processing.if a vector file is used by two mapsets at a time, which one will be saved first and why.if a team want to work on the same set of shape files, what is the ...
1
vote
0answers
53 views
Editing QGIS point layer: retrieve attributes of intersecting line layer
I'm creating a custom editing form using QGIS 2.0 and would like to modify the mouse event when creating a point. I've gotten a start by reading this thread: How to programatically check for a mouse ...
0
votes
0answers
30 views
how to easily serve vector layer with extra attributes for openlayers
On a website I'd like to show an openstreetmap with buildings colored by a certain feature (tag). So far I was able to extract the buildings for a bounding box, save them as an osm file and load it ...
4
votes
1answer
64 views
Generating a vector contour map of fictional terrain
Originally I had asked this on the Graphics Design SE but after some realization of the question I was asking, it's probably better to ask it here.
I'm making a fantasy world map in illustrator that ...
1
vote
1answer
53 views
CartoDB map in openlayers
Is there a way that i can upload my CartoDB map in Openlayers as a WMS layer or Vector layer. Here is the my CartoDB map link.
http://cdb.io/1nxdrpf
0
votes
1answer
20 views
Trace vector map from GeoTiff, Garmin
My goal is to create a vector map for my Garmin GPS by tracing over a topo raster. The vector data would be exported in ESRI SHP format and later converted for Garmin. So far, I can load the geo ...
0
votes
0answers
25 views
Positional error of line features
Does anyone know how to model the error in the spatial location of a line? I think Survey Analyst extension in ArcGIS had a possibility to construct ellipse errors but it is not available any more. Is ...
0
votes
0answers
37 views
Turn vector layer in raster layer based on cost
Hy,
I am trying to rasterize some vector layers into raster layers and I know this is possible with QGIS by using the rasterize function in the raster menu but I don't know how to do the following ...
1
vote
2answers
57 views
QGIS 2.0 Automatic generation of a vector layer out of a point layer
I am an environmental engineer and the aim of my QGIS 2.0 project is to visualize the results of a sewage water system inspection. In a first step I included the hoppers from a csv file and added a ...
1
vote
1answer
50 views
QGIS combine Vectorlayer and Rasterlayer to one shapefile
I have to create some Thematic Maps, especially Choropleth Maps on Matlab.
Therefore i've found a shapefile which I can use, but need to draw some lines there.
I've imported my shapefile as a Vector ...
0
votes
0answers
35 views
How to achieve labeling in openlayers as Google did?
I am tried to find a solution for my question.
Please look the images below.
Google
Google are awesome!!..
They are doing fantastic technique in labeling part. Please look the marked labels, the ...
0
votes
1answer
38 views
Invalid geometry message when using Difference tool
I am using the Vector \ Geoprocessing \ Difference tool to get the resulting area when taking a) current ground disturbance away from b) historic total ground disturbance to give c) what has been ...
0
votes
0answers
15 views
GRASS GIS - v.select- ERROR: bad allocation -
I'm quite new to Grass GIS.
I have two vector maps, one of a grid (each grid cell is a polygon) and one of a much larger polygon. I've been trying to select the grid cells that lie completely within ...
1
vote
1answer
54 views
How to automatically transform between base layer and vector layer in OpenLayers
I have a simple example on http://jsfiddle.net/29bsw/
I have a map with an OSM layer as base layer and an additional vector layer. The projection of the map is defined as EPSG:900913 and the ...
0
votes
1answer
42 views
Geomedia WebMap WFS to vector marker layer in Openlayers
Looking for minimal example/advice on getting a WFS service to show up as a vector layer with markers/icons in Openlayers map.
I have created the WFS service in Geomedia WebMap 6.01.11.19 and the ...
0
votes
0answers
146 views
Qgis ver.2.2 can not load osm file
I have download shapefile osm with vector >> osm >> downdload data in qgis ver. 2.2. When i I open osm data,qgis not responding. I hope someone could help me. Thanks
1
vote
0answers
22 views
Is there any GRASS command to measure the distance between a point in rastermap and another in vector map?
I have a question about WinGRASS 6.4.3.
Is there any GRASS script command to measure the distance between a point in rastermap and another in vector map?
I have a raster map and a vector map. Raster ...
3
votes
1answer
46 views
Where to get the modern Constellations as a vector File?
Does anyone know where I can get a vector version (shapefile/TAB) of the modern star constellations for the entire sky?
Wikipedia has a SVG - ...
0
votes
0answers
19 views
What information, Open Attribute table of stream segment shows?
I have delineated the watershed from DEM data. I have converted the stream segment(raster) to vector lines. In the attribute table of this vector lines, there are 3 columns, CAT, VALUE, LABEL, what ...
0
votes
0answers
23 views
Clip vectors in workspace / map extent (QGIS 2.x)
Good afternoon,
I am looking for a way to clip several vector layers within a project or folder (with subfolders) and ideally save them with a name change (suffix / prefix) to a new folder / output ...
0
votes
0answers
20 views
Show the paths but not roadsides and driveways in the line layer
I want to display paths in the woods but the paths are all in One (line) layer that contains all roadsides, pavements, drivvays, but also paths, tractor road and other relevant roads in, and up to the ...
0
votes
0answers
18 views
How to draw some ellipses that can cover some categorized points automatically in QGIS?
Instead of using Rectangles Ovals Digitizing plugin to draw some ellipses manually, is there another way to draw them automatically that can cover some categorized points in QGIS?
0
votes
1answer
74 views
Vector Tile Rendering on iOS
I'm developing an iOS app for displaying my own custom map data (on GeoServer). The SDK I'm using to display my map is route-me (Alpstein fork) as the map viewer for now. route-me supports raster ...
0
votes
0answers
27 views
Zonal statistics won't work after re-projecting vector layer
I have qgis 2.0.
I want to analyze raster information within a buffer of 30 miles around a vector layer of cities across the world. However, both the raster and the vector are in WGS84. I have no ...
0
votes
1answer
73 views
Polygonize(raster to vector) [closed]
I have been install QGIS 2.0.1.when I use Polygonize (Raster to vector)for convert jpg to shp I get error message such as:
C:\windows\123.exe is not recognized as an internal or external
...
0
votes
1answer
23 views
Multiple vertices after editing giving wrong start and end x, y co-ordinates
I have a small problem which I have been fighting to solve but in vain.
Initially I generated some polylines across the river at various locations. I found some of them are smaller in size and not ...
0
votes
0answers
22 views
Shifting Polyline Feature Class
I need to horizontally shift a Polyline feature class (clip1diss) (just one raw) 360 degrees East (deltaX = 360).
It would be the equivalent as to "Move" in an Edit session in ArcMap but I cannot ...
0
votes
1answer
28 views
QGIS problems getting layers to line up correctly.
I am trying to add a raster layer and a vector layer to qgis. I have set both of their CSR to NAD83 Oklahoma North State Plane. It doesn't seem to work even with all the files set to those CSR. ...
0
votes
0answers
28 views
QGIS pixel/square cms using scale, dpi
The data (vectors) I'm using are 5cm in resolution. I think that resolution refers to accuracy of the data and not the image resolution.
I've produced maps using the QGIS print composer and exported ...
0
votes
2answers
107 views
How to capture contour lines from OSM cycle map as vector?
In QGIS, there is a plugin to insert a OSM cycle map layer, that brings as an image from http. But I can't convert this OSM Plugin layer to a raster image.
I can't even imagine how to get the contour ...
