Use the `raster` tag for questions about raster datasets. A "grid" is a regular partition of a spatial domain into congruent nonoverlapping pieces or a set of lines forming a grid-like pattern (aka "graticule").

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How to accurately join data based on 1x1 degree grid-cell points to a shapefile

In the data file each row represents a country and a grid-cell at 1x1 degree resolution, and the given coordinates, in longitude and latitude, label the south-west corner of the grid-cell. The ...
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15 views

Can a joined-layer have its attribute changed depending on what layers are selected/deselected?

Using QGIS, I have a polygon-grid layer which covers everything, Layer_All joined with 2 other grid layers: Layer_1 and Layer_2, both of which intersect at various points. I would like Layer_All to ...
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16 views

Edit a classified grid file (.grc) to improve accuracy

I have a .grc file (classified grid file) which contains some clutter information, forest, sea, woodland, etc... I need to alter the data in some area to improve accuracy. Basically a larger forest or ...
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25 views

Does a road connect one grid cell to an adjacent grid cell?

So here is the problem I am working on. I have an OpenStreetMap roadmap which I overlaid with a 2-D cartesian grid. So for a given grid square, I want to find out if a road segment continues from the ...
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1answer
56 views

Surfer problem - overlapping grd bln

I have the following problems with Surfer: 1, I have a grid file and a bln but i'm not sure that they overlap each other exactly. I set the coordinate system with grd and bln! (WGS84) but there is no ...
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1answer
41 views

How to Lock Grid and Scalebar in QGIS Atlas

Have just started using Valmeira and I am looking at generating an Atlas. I am using irregularly sized features as the index. The challenge I have, is when I set up the template page and scalebar ...
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1answer
66 views

Grid Index Features ArcMap 10.0

I am developing a custom script for a small company. The rule of this script is to create something like the Split tool but in Basic License level. So, at first, I Would like to create an Index ...
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1answer
47 views

Measured Grid won't show

I'm fairly new at this, so maybe this is a simple issue. I'm trying to make a map that shows a grid of 50 meter by 50 meter boxes. I've done the Data Frame Properties for a measured grid and made ...
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8 views

Erdas grids names to field names in tables renamed when saved

I am trying to use zonal stat on several imagine rasters and save values to a table with several automatically added fields that will have the same name of the corresponding raster, I can do it but ...
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33 views

tif file creation

Does anyone have any idea how to get around this problem? I've been looking for a solution to no avail. I'm trying to convert a shp file to a grid, and the tif is hanging up. Output raster layer: ...
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25 views

Using a grid of points to generate polygons [duplicate]

I have a csv that has lat/long points for all corners of a perfect grid over an area I am working with. I need to take these corners and generate a shape file with individual polygons for each grid ...
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40 views

Intersect two rasters with similar scale in PostGIS

I'm working on a project in which we have a ~100x100km grid with ~1x1km cell sizes to which we are trying to aggregate other data, including point, polygon, and raster data. This grid is a collection ...
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107 views

Shapefile of points to grid

I am looking for a method/prog/library(java) to interpolate points from a shapefile to a grid (file). I have seen arcgis can do that but i am looking for something free. More specific: i have ...
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31 views

How do I insert grid lines of latitude and longitude into my map in QGIS (Lisboa)? [duplicate]

I'm having trouble in figuring out how to add grid lines of latitude and longitude into my map that I have geo-referenced in QGIS. Is there a plug-in to add/install? The CRS I am utilizing atm is ...
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73 views

Route through water polygons

I have a water-polygon grid shape file as shown (Each grid is 1latx1long): I have created this in QGIS and files (coastal lines and land polygons) selected from http://openstreetmapdata.com/data ...
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80 views

Polygon dynamic grid creation for a shape file

I have used QGIS Vector->ResearchTools-> Vector Grid to create a 1lat x 1 long grid for the landpolygon shape file (from osm). Now, I am interested in creating dynamic grid for the original ...
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46 views

Borderlines of states subdividing my GRID

![enter image description here][2]I just merged a map of a country with its states, so I went from having 1 feature (the whole country) to 32 features. Is there any way to have the borders of the ...
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1answer
133 views

How can I label each gridsquare in an MGRS grid individually?

I want to be able to generate an MGRS grid of arbitrary resolution (say, 1km or 100m) and have each grid square individually labeled with its full MGRS coordinate. This was easy enough to do with the ...
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95 views

How do I determine programmatically what values to add to the proj4js constructor for a CRS or SRS such that I can iteratively render proper overlays

I think this is primarily a GIS based question as far as for example: var crs = L.CRS.proj4js('EPSG:2154', '+proj=lcc +lat_1=49 +lat_2=44 +lat_0=46.5 +lon_0=3 +x_0=700000 ...
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2answers
269 views

QGIS regular points around each polygon in a layer (vs ALL polygons)

I have a number of buffered points (some where polygons intersect & are dissolved. I'd like to create regular spaced points grid around EACH polygon -- not ALL polygons. When I do Vector -> ...
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933 views

Lat/long grid in QGIS using WGS84 projected layers [duplicate]

I'm using QGIS to project some shapes that are in WGS84 coordinate system. I want to add a grid to the map in the map composer but when I try to do it the degrees don't show up. I have tried to do ...
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1answer
113 views

Why are grid and scalebar measures 1mm too long in a 1:10000 print?

I used qgis 1.8 to compose a map from the WMS-service of the Belgian NGI. I added a scalebar and grid to it. When I measure it by hand, the distance between the longitudelines is 101mm instead of ...
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133 views

SAGA grid VRT, file how to apply a LUT?

I've created a heap of saga grid files for some hydro survey work. I'm looking at a way to read these into a mapguide raster/grid layer, I'm able to load up the grids using a vrt file, I can't figure ...
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2answers
288 views

How to implement a spatial query on polygon data for a specific point?

I have vector data fed into a database which returns a report at province level upon querying. This is implemented in a web tool. I want to add an extra functionality at point level, where I can ...
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1answer
543 views

Exporting Grid from R to use it in ArcGIS

i want to export a grid from R into format readable by ArcGIS. how can i do so? jones
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1answer
306 views

how to run an aml in python

I am trying to run a aml in a python program I am writing and haven't been having much luck figuring out the correct way to run the aml. The aml requires workstation to be in grid mode. Any tips? I am ...
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1answer
322 views

how to make grid cells by point data

I have a csv data. the X, and Y columns show bottom left corner of each grid. It is supposed to show as grid square, but it shows points. what is the problem? and is there any way I can make cell ...
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1answer
106 views

How to locate 'symbols' by means of grid cells in MapInfo?

I am new to Mapinfo and GIS in general, but I have a new job in a company that works with maps and GPS and now I am being trained. My question, and I have looked a lot and I couldn't find anything, ...