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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3
votes
2answers
26 views

Generic Grid to Coordinate System

I have been given a large dataset of X,Y positions of animal movements in a generic grid system. It uses 0,0 as an origin and then position units are in feet from origin. I have the geo-referenced ...
2
votes
2answers
877 views

UTM Grid as a Layer with Leaflet

How can I display a UTM Grid as a layer with Leaflet? Search a way to embed a OpenStreetMap map with Leaflet in a website. Particularity. I want to display a UTM Grid as a Layer. In addition, lower ...
3
votes
2answers
22 views

QGIS ASCII Grid output problem

I have this .asc file of maximum temperature of a local place. This file is a result of vector to raster (GeoTIFF) conversion then GeoTIFF to ASCII grid conversion, both using QGIS. Here is a snippet ...
2
votes
1answer
119 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 ...
2
votes
0answers
33 views

Changing grid orientation of a raster

I'm trying to load some XYZ data into a program called OpendTect. However, the orientation of the existing data is different from the grid orientation of the XYZ file. this makes it imposible to load ...
2
votes
0answers
25 views

How to calculate grid convergence (True North to Grid North)?

I would like to know how to calculate the grid convergence angle between True North and Grid North for UTM maps. I am using ArcGIS 10.0 (ArcView licence) and have used the "Calculate Grid ...
3
votes
1answer
163 views

draw lines with an angle inside a rectangle in python

I am trying to make a plugin for Qgis with python. I have the four corner coordinates for a rectangle. I want to give the user the inputs, line space and angle (0 -180 degrees). With these inputs, I ...
4
votes
0answers
63 views

How to determine the optimal raster resolution when interpolating a surface from points?

I'm looking for guidance on how to determine the desired output resolution, when interpolating a surface from irregularly-spaced point samples. I have a series of boreholes taken across a city, and ...
1
vote
1answer
74 views

how to permanently add raster to satellite image in qgis

As mentioned in the title i need to integrate a raster to a satellite image but have no idea as to how to do this. I tried the add grid function and it works nice but is not permanent. I insert it ...
0
votes
1answer
74 views

How to make a grid in ArcGIS 10.2 with specified rotation angle

I'm working in this project and I need a gred with a certain rotation for example 60 degrees. Starting from that I need to make a block of 20mx50m, and the last thing is that inside each block there ...
1
vote
1answer
129 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 ...
2
votes
2answers
113 views

How to draw a square from 2 coordinates?

I have a CSV file with the following output id, x min, y min, x max, y max, value 1 , 0 , 0 , 100 , 100 , 5 2 , 0, , 100 , 100 , 200 , 10 3 , 100 , 100 , 200 , 200 , 15 4 , 100 , 0 ...
1
vote
0answers
27 views

georeference a grid by using a script

I've got an image and a set of coordinates, which represent a grid, that looks similar to this: What I'm looking for is a script, that would transform my image, by using such a grid. Edit: My ...
1
vote
0answers
28 views

How to convert shapefiles into ascii grid .asc in QGIS?

I downloaded multiple zips that cover a small island from the Rhode Island Geographic Information System webpage, specifically the geographic files that make up Block Island. Here's the source: ...
2
votes
0answers
26 views

Extracting gridded data from polygon vector layer

So I've spent a few enjoyable (and frustrating) days teaching myself the basics of QGIS and fiddling around to try get some data output I need to drive some calculations. Sadly I'm not having any joy ...
1
vote
0answers
9 views

Calculation of RMS between two grids [duplicate]

I want to calculate the RMSE of two grids based on their z-value: a calculated and a reference grid. I do have the statistics: Cells, Range, Min, Max, Sum, Mean, Variance, St.dev. How could I solve ...
4
votes
3answers
125 views

Can you recycle shp and shx files in a shapefile vector grid where only dbf data changes?

I'm periodically getting data from an external partner that is bound to a very large vector grid in shapefile format. The grid itself sits at around 400~ megabytes, but the only data that ever changes ...
0
votes
1answer
32 views

Is it possible to create one raster elevation layer from two different point layers in QGIS?

[I edited this question after recieving some helpfull comments from users]. I have two layers with X,Y,Z data. The data overlay only partly. Is it possible to create one raster layer with elevation ...
7
votes
4answers
1k views

Overlay a spatial polygon with a grid and check in which grid element specific coordinates are located

How can one use R to split a shape file in 200 meter squares/sub-polygons, plot this grid (incl. ID numbers for each square) over the original map below, and evaluate in which square specific ...
1
vote
0answers
81 views

Spatially join points to polygons in arcGIS

I am trying to join a point feature class to a gridded polygon feature class in arcGIS so that all the points are matched to the grid cell that they fall within. I would like to end up with an ...
2
votes
1answer
42 views

How set correct options for displaying a grid in QGIS composer?

I am using q. 2.5 4291337 in Windows 7 64 bits. I am working with raster and vector layers in EPSG 26714 (UTM NAD27 14N). In this version of QGIS, you are able to put a grid in a different CRS of the ...
9
votes
3answers
242 views

A global, grid-like projection for creating heatmaps

I'm putting together an application where I need to create a vector grid which will be used to store and display a heatmap. It has the following requirements: Can cover the entire planet. The vast ...
3
votes
0answers
32 views

How to calculate 90% confidence interval in a raster stack

I have a stack of grid files (23) in ASC format from a MODIS sensor and I need to calculate a 90% confidence interval, mean, min, etc, for each one in R, how can I do that? specially the interval. ...
2
votes
0answers
35 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 ...
3
votes
1answer
48 views

How to model a geodesic grid in PostGIS?

Abstract I've decided to use PostGIS for a hobby game project. It requires a lot of units allocated on the surface of a planet. I'd like to model not only the units (simple points), but also their ...
1
vote
0answers
69 views

How to import a map consisting of pictures

I want to built some sort of Fantasy Map with Quantum GIS. The whole map is built out of 128x128 single pictures, 16384 in total. It should be a flat map. How do I import these pictures and align ...
2
votes
2answers
93 views

How to determine in which grid cell each coordinate of an x,y series is located?

I have a circular arena which I have divided into a number of equal-sized 'cells' using a grid-like arrangement of concentric circles and line segments (in grey below) and also a series of x,y ...
1
vote
0answers
20 views

How to rotate the screen in ArcGIS-Online?

I need to print out my map in ArcGISOnline, however I'm using a grid system and need to rotate the screen so that I can print each map individually and have them line up. Any thoughts on how to do ...
1
vote
2answers
94 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 ...
1
vote
0answers
16 views

Vector Layer Symbol (ism) properties?

I would like to streamline the render of a polygon grid vector layer as a simple line (no fill) via Python coding. I am I bit confused by the implementation referenced by the API. Is it possible to ...
0
votes
1answer
32 views

Rank cell values across multiple grids

I have multiple grids, one for each month of a year. I would like to create a new grid for each month/year combination that the cell value is the percentile rank of that cells value in the grid stack. ...
1
vote
1answer
44 views

How to compare polylines attribute from the same GRID cell in ArcGIS 10?

I need some help because I do not know how to model this issue: I have two polyline shapefiles. They have an attribute that I need to be compared. These are roads from different sources. So, I have ...
0
votes
0answers
19 views

Raster Analysis Grid (Interpolation) Crashes

Upon clicking on "Grid (Interpolation)" QGIS crashes. I running QGIS 2.2.0-Valmiera on a Mac with OS X 10.9.4 Thank you for any trouble shooting guidance
1
vote
1answer
42 views

Counting number of points in 1 km grid covering surface of Earth?

I want to cover surface of earth with equal sized shapes and count number of points within each cell. shape of cell doesn't matters (triangle, hexagon ...), neither area, but equality of them is ...
0
votes
0answers
30 views

convert csv file into grib2 format using wgrib2

I have used wgrib2 in terminal.And convert grib2 file into csv file to view content of grib2 file.my command is, wgrib2 CMC_naefs-geps-raw_ARAIN_SFC_0_latlon1p0x1p0_2014022012_P012_allmbrs.grb2 ...
0
votes
0answers
47 views

How to create correct vector grid in meter

I want to create a vector grid, with squares of 100x100m but have some serious trouble in solving this apparently easy task. I already read all the posts, but didnt find a good solution. Here is what ...
0
votes
1answer
91 views

Why do I get an error when I try and clip a shapefile to a shapefile using ogr2ogr?

I want to clip a shapefile to a shapefile. The input shapefile is a 1 m vector grid generated in QGIS. The tile I'm clipping to is just a simple polygon (the geometry is contained within the 1 m ...
11
votes
4answers
1k views

How can I generate irregular grid containing minimum n points?

Given a large (~ 1 million) sample of unevenly distributed points - is it possible to generate irregular grid (in size, but could also be irregular in shape if that is possible?) that will contain ...
1
vote
1answer
30 views

What is a better idea for modelling a fault plane than as TIN? [duplicate]

I am working on a project which runs on ArcGIS platform using VB.NET. It is to model a sub-surface fault plane (currently a plane rectangular model with some dip) and then to find required distances ...
1
vote
1answer
106 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. ...
0
votes
0answers
142 views

adding a column containing buttons in dojo grid arcgis jsapi

I am using ArcGIS jsapi to develop a web application where I use a synchronous geoprocessing service that return a shapefile. I used the shapefile table to populate 2 dojo grids depending on the value ...
3
votes
1answer
58 views

Creation of tiled grid in JAVA with geotols

I am trying to create a grid using GeoTools in JAVA, covering specyfic area with resolution 50 m (distance between two points). To do so I have two points: the most nortwestern (let's call it NW) and ...
0
votes
1answer
83 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, ...
0
votes
0answers
20 views

Changing tracks to vectors in a grid

This is a version of a question that I posted on the GRASS list, but I didn't get any suggestions there. I would like to overlay a grid (cell size about 500 m x 500m) over an animal track created from ...
1
vote
1answer
190 views

Creating grid polygons from coordinates using R or Python

I have locational data with north-south and east-west coordinates, with a resolution of 100 meters squares. Each data point's location is somewhere within the 100 meters square which centre is given ...
0
votes
0answers
62 views

how to compare multiple time series of raster files

I am looking for the best way to compare the spatial patterns of multiple time series composed of many raster files, in R. The cell values of each raster is continuous, and I am comparing time series ...
0
votes
2answers
346 views

ArcGIS: Export GRID to TIFF keeping its (classified) symbology

I want to export an esri grid-raster into a *.tiff without losing the symbology I created for the grid (the symbology is classified). No matter how I try to solve it I get a stretched symbology in ...
0
votes
0answers
26 views

gdal_grid data from 2 different utm zone

I'm developing a component which grid data over Vietnam region using gdal_grid from gdal. Follow gdal example I've successfully griding data within 1 specific UTM zone. However, for data over the ...
2
votes
0answers
57 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 ...
1
vote
1answer
139 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 ...