Refers primarily to graticules and questions about drawing or constructing them. Use the `raster` tag for questions about grid-based datasets.

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40 views

How to inverse Y axis

I have a SQLlite database containing cached tiles with X,Y,Z fields and I want to use it in MapCache. My Y field is appearing upside down in Google tile index but I want to inverse it like this: ...
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1answer
91 views

How to create a grid after merging shapefiles?

Follow up question to QGIS Model Builder Script - Possible to merge layers in a folder? I think I'm missing something very obvious here but can't seem to find it. After merging shapfiles in a folder, ...
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0answers
69 views

How to move points to another polygon based on attribute?

I have a point layer and a grid cell/fishnet layer. Each point falls within a grid cell. Now I want to move some of the points to another (the nearest) grid cell based on an attribute that exists in ...
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1answer
161 views

Auto increment a new column using Model Builder Field Calculator in QGIS?

I am making a model which requires creating a grid and clipping various layers to it. Using the Create grid function does not provide an ID column, instead it creates 2 columns: "longitude" and ...
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0answers
111 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 ...
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0answers
35 views

How to deal with political boundaries in grid cell analysis?

I have point data for Africa and I want to aggregate these data to grid cells which I create by a fishnet. Some grid cells cover parts of 2 or 3 countries. Normally, such cells are by different ...
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0answers
46 views

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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0answers
21 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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41 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
94 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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2answers
632 views

How to convert a shapefile to a grid file

I was wondering whether anyone might be able to tell me in layman's terms how to convert a polygon layer to a Grid file in ArcGIS 10.1 or ArcGIS 10.2?
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1answer
77 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 ...
2
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1answer
160 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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2answers
664 views

Creating DSM and DTM from a LAS using a freeware solution

Is it possible to export a surface and terrain model files from an aerial, LiDAR point cloud (LAS) set? I am using SAGA GIS for very basic operations, but I couldn't find this option (and I have a ...
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2answers
32 views

attach point grid data non-grid points

Possibly a strange one: I have a dataset with loads of fields of environmental (explanatory) data, as a regular grid of points (black dots in image), and another dataset of sampled (response) values ...
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1answer
148 views

How can I add grid lines to a print composition using pyqgis?

I'm writing a qgis plugin to create an image in the print composer of the current map. I can get the map rendered in the proper place with a frame of the right width, and I can get grid annotations ...
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2answers
61 views

How can I change vector grid extents in QGIS?

I created many vector grids, but later I discovered that I need to modify some of their extents, hence, How can I change vector grid's extents (xmin, xmax, ymin and ymax) in QGIS?
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2answers
116 views

gdal_grid has some problem with reading vrt file

I am using gdal_grid module(from gdal 1.10) and it has some problem with reading the vrt file. I checked this link but it does not work. gdal_grid problem reading vrt file The command is ...
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1answer
357 views

Terminology problem - Raster vs Grid vs Lattice

I have a question about GIS terminology - what is the difference between grid and raster and grid and lattice - in theory?? I thought, that raster is regular network and value is in the cell and the ...
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0answers
88 views

How can I draw georeferenced WGS84 grid on Android?

I'm planning to display a grid which is georeferenced and show the lat/long of the particular location depending on zoom level. I want to display something similar to what MOBAC has as an option ...
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0answers
11 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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1answer
133 views

Convert point to grid: Numbers of cells differ

In R I am trying to aggregate points data to a grid. The data for the grid (G-Econ) comes as a csv-file. In this file each row represent a grid-cell at 1x1 degree resolution and the given ...
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0answers
300 views

Updated: Openlayers Vector Layers with Google Map Base Layer (via Grid): Vectors Stick but can't get correct resolution/projection

Revamping this question instead of opening a new one. Previous issue: vector layers were not "sticking" to the map, so when you would zoom in or out the vector layers would "come out" at you. Note ...
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2answers
2k views

How to make RASTER from irregular point data without interpolation

I was trying to make a raster image from an irregularly spaced point database. The data looks like- > head(s100_ras) x y z 1 267573.9 2633781 213.29545 2 262224.4 2633781 ...
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0answers
114 views

How can I improve the resolution of a vector grid made in north pole stereographic projection?

I've been struggling with this for a while and wondered if someone could lend a hand. I have a map which already has sampling points from centroids in a 35x35km grid that was created in north pole ...
2
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1answer
48 views

Questions about EPSG:6372

I'm using QGIS 1.8.0 and as CRS EPSG:6372 a projection for Mexico, defined by the Instituto Nacional de Estadística y Geografía (INEGI). I have the following questions, I hope you can help me out. ...
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0answers
118 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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1answer
76 views

Why does vector grid creation crash?

Im trying to create a vector grid for a municipality. Do you know why does it crash? The scale I'm using is 1:1000000. Any tips? Thanks!
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1answer
73 views

Which kind of grid format is this?

in a project I got some raster files with the following content (header and data are in one txt file): HOUR 17 MINUTES 30 YEAR 2012 MONTH 5 DAY 4 CITY Emilia;Bologna NROWS 99 NCOLS 156 ULXMAP ...
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0answers
91 views

ArcMap 100k meters square identification - double?

ArcMap - 1:50.000 - 5x3 meters - MGRS I put on a grid defined with the standard 1:50.000 grid style in ArcMap. I tick the box for "100,000 meter grid square identification", but it makes it ...
4
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1answer
94 views

Rasters stored in folder: Is there a limit at 5,000?

I have a python script that creates batches of ~6,000 cost distance rasters. These rasters are intermediate data that will be summarized in another process. Output is stored in plain old folders. ...
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2answers
183 views

Integrate grid and polygon of municipalities keeping the biggest municipality per cell with QGIS (or another)

I have a 9x9 grid and a polygon of municipalities of an extensive area of Brazil. My goal is to have a field indicating the biggest municipality per grid cell. I've been trying with intercept without ...
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1answer
1k views

How to convert a bil image into grid in ArcGIS?

GIS beginner here. I've downloaded RFE data from FEWSNET. It's a compressed file which includes .bil files. Now i want to convert this ".bil image" into a grid to use the precipitation data in an ...
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1answer
168 views

How to make grid lines opaque so just lat/long coords are on map border?

Can any one help me with adding graticules to my map? I have managed to add a lat/long grid over my map, however I want the grid lines to be opaque with just the lat/long coords on the map border - is ...
2
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0answers
389 views

GDAL: Geotransform - rotated rasters (and ArcGis)

I am working on a GDAL driver for a proprietary grid-format. In some cases, the grids are rotated in order to get smaller file sizes. In my GDAL geotransform array, I do the following (showing a ...
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0answers
77 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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1answer
113 views

ArcGis: Rotated grids and cell size

I am using ArcObjects, namely RasterGeometryProc, to apply rotation on grids. The transformation works fine. However, when looking at the grids properties in ArcGis, the cell sizes has changed. ...
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0answers
91 views

How to rotate u and v components of wind in rotated gribs?

I have a grib message of a rotated hirlam product. The gribmessage states, that the u and v component contained are relative to the rotated grid. How can I unrotate them?
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1answer
39 views

Why are color settings are not saved when exporting to a new file?

I extracted with QGIS a municipality from a state map, then divided it with a grid. I don't want the borders of the grid features to be seen so I changed the color of the map and the color of the ...
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0answers
95 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 ...
2
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1answer
54 views

Divide map into features with invisible divisor lines

I'm working with QGIS 1.8.0. Is there a way to divide a map with a grid but make the divisor lines invisible? I have a shapefile as the one in the left and I want it to see as the one in the right but ...
0
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1answer
186 views

Polygon grid shape file for landmass

I am interested in generating a polygon grid shape file for the landmass of the world. What I have presently is two tables in postgreSQL. Table 1: Coastal area shapefile ...
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1answer
72 views

How to know the real size of grid? [duplicate]

Im working with QGIS. When dividing a map with a grid I set in the paramters X=0.1 and Y=0.1. Could someone please explain what does that mean? I mean would the map be divided into 100mx100m squares? ...
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0answers
49 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 ...
1
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1answer
115 views

Dividing map into features (whole squares)

I'm using QGIS 1.8.0. I divided a map of a state with its municipalities into many features using a GRID (small squares), but instead of creating one ID per feature (one ID per square), it creates one ...
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0answers
40 views

simple raster format to use in Web applications?

I'm building a Web application in which users create and edit very coarse raster data. They're assigning values to cells in a georeferenced grid. Right now I'm storing the values in a multidimensional ...
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2answers
394 views

Openlayers Plugin, Project CRS and Grids in Composer

Apologies in advance for the potential for this to be a duplicate question, I've had a good look, and I can't see a solution thatI understand well enough to help me. I have my project CRS set to a ...
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2answers
118 views

AML routines and python

I´m trying to use some AML files in ArcMap 10, but I have noticed that this option is not available for this version. Does anyone know or tried to "translate" the aml sequences to another language ...
3
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1answer
99 views

How to tell the size of grid cells created by the vector grid tool?

Im working with qgis 1.8.0 and Im making a vector grid on a map. Does someone know how big are the squares if the grid settings look like in the picture? Thanks for your time!
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3answers
2k views

how to create grid to divide large map into smaller sections

This seems like it should be easy but I just can't find anything online that tells me how to do it. I have a map of small remnants of forest along creeks for an entire county in California. I need ...