Questions tagged [vector-grid]

Use for questions about vector grids which are also known as fishnets. For questions about the Leaflet Plugin please use the tag "vector-tiles"

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0answers
37 views

Troubleshooting creation of equal-area fishnet inside rectangular polygon

I have a set of polygons that are rectangles (10 km by 1 km dimension), and I'm using Fishnet to create smaller polygons (which I'll call "boxes"). The boxes need to be equal area, so I am working in ...
2
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1answer
199 views

Creating time-space map by distorting city-points polygons using QGIS?

I've already 3 main layers on shp in qgis: the points of some places, the cities polygons and a grid of 10km, as you can see on the image. I would like to distort the map using time values to modify ...
6
votes
1answer
705 views

Turning vector grid into individual shapefiles using QGIS?

I am using QGIS and I created a vector grid on a crop field in order to cut it into plots. I want to save each grid cell into individual polygon shapefiles automatically. Here is an example of a ...
1
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1answer
426 views

Attribute Error: 'unicode' object has no attribute 'extent'

I keep getting this error from this line. arcpy.CreateFishnet_management(os.path.join(Output_Folder, "Full_Grid.shp"), str(NAR_U9.extent.XMin) + " " + str(NAR_U9.extent.YMin), str(NAR_U9.extent.XMin)...
-2
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1answer
38 views

Syntax error in arcpy.CreateFishnet_management

I can't seem to find the syntax error in this line. Can anyone else find it? arcpy.CreateFishnet_management(Full_Grid, str(NAR_U9.extent.XMin) + " " + str(NAR_U9.extent.YMin), str(NAR_U9.extent.XMin) ...
2
votes
1answer
73 views

Calculating partial distances from whole segment in grid using QGIS?

I am using QGIS and trying to find a way to calculate partial distances of lines in a grid. In the left part of the picture you can see the sum of the line lengths within the grid cell (108.96...), ...
1
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1answer
195 views

Using Create Fishnet and Project in ModelBuilder?

When I try to run the model below, the Create Fishnet tool creates a huge grid that totally ignores the extent input (BLOCK_Project1). It's nowhere near the extent input either. If I click on the ...
1
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0answers
60 views

Extracting point attributes to polygon grid in QGIS

I have point data of endagered flowers found in a number of locations. Each location may have up to hundreds of flower registrations. I want to end up with a 1x1km grid colour graduated from the ...
1
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0answers
66 views

Extracting Grids containing 50% polygons (from land use layer) using QGIS?

I have a vector layer of Parcels for a certain area. I need to make grids of 100m * 100m over the parcel layer and then extract those grids which contain 50% or parcels by area. I am currently using ...
1
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1answer
68 views

Distance mistake during grid creation

I'm working on a script where I create a grid with the bounding box of a geodataframe, a width and a height (they might be equals for a square grid). I don't know why but when I try to make a 10m ...
4
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1answer
338 views

Coordinates from create grid

I am setting up a hectare grid in QGIS 3.0 using Vector > research tools > create grid > grid type:point and then defining boundaries by a preexisting polygon layer. I would like to get coordinates ...
1
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0answers
239 views

Georeferencing lat/lon .png map and adding grid using lat/lon? [closed]

I'm trying to input a .png map into my QGIS project for a small area in South Africa. I don't know the CRS used to create the map but it has a grid system on it with the lat/lon labelled (created ...
0
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1answer
41 views

Preventing ArcMap from labeling when creating grids?

I am using the Create Polygon Grid Wizard to make a large number of grids. Is there anyway I can stop ArcMap from drawing the grid labels as they are created? It seems to take much much longer to ...
0
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0answers
40 views

Adding median values of several rasters (geotiff) to each fishnet polygon (200x200metres fishnet) using ArcGIS ModelBuilder?

I have a 200x200metres fishnet of my study area, with a few attributes in it, like land use, percentage of each landuse class. Now I need to add the median value of more than 10 rasters to the ...
2
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0answers
205 views

Modifying vector grid using QGIS?

I would like to extend a vector grid of 1x1 km to a neighborouring area. The best option for me would be to simply modify the existing layer This grid has been first made in ArcGIS, but I use QGIS so ...
0
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0answers
285 views

Generate XYZ coordinates of DEM mesh/grid

Is there a way to generate a wire grid of plain text XYZ coordinates starting and ending points for each wire segment? I want to generate them from a digital elevation model. Preferably with gdal/qgis ...
0
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0answers
58 views

Creating regular grid cells (square) by ArcGIS Desktop through geographic coordinate system?

I need to create grid cells (square =1000*1000 meter or 500*500 meter) by ArcGIS through the geographic coordinate system. It worth to be noted that the latitude coordinates between 22~23 degree.
3
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1answer
525 views

Counting occurence of unique points across large grid using QGIS?

I am attempting to map out, in a 10x10 km grid, the occurrence of unique plant species. I have used the "Points in Polygon" feature to count and map the unique points across the grid, however I have a ...
1
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1answer
333 views

Merge grid and point vectors in Qgis

In qgis I have a grid, i have a point vector for each cell of the grid, i want to make the mean of one attribute of the vector. How can I do that by not making a raster?
0
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1answer
253 views

Using Presence/Absence method in QGIS?

I seek advice for calculating presence/absence of features in QGIS. I have a polygon dataset of boundary outlines and a number of other datasets which I want to compare it against for presence/...
0
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1answer
662 views

How to rasterize point data into a grid which can ensure 1 point in each cell at most

I'm trying to create a raster whose grid cell takes at most one point. The data looks like this: > head(ras) lon lat z1 z2 1 267573.9 2633781 213.29545 6 2 262224.4 ...
1
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2answers
427 views

How to generate grid shapefile with grid squares that align with landmasses in R

I have a hard time trying to describe the shapefile exactly, but I am trying to generate a grid over the Gulf of St. Lawrence, such that only the gridsquares which lie over water are included. I would ...
1
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1answer
843 views

Creating species richness map (as next stage after species distribution)?

I'm using ArcMap. I've read the messages related to this topic but they don't take me far enough. Most of the advice is related to species distribution, but I need to create a species richness map. ...
5
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0answers
372 views

Using QGIS 2.14 to creating a evenly distributed grid of points, spaced 500m apart, that takes terrain into account [closed]

I am using QGIS 2.14 (Essen Version). I need to create a grid of points within a given area so that each points 500m across the ground from any other point. At these points trail cams will be placed,...
0
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1answer
539 views

efficient workaround to treat missing values in gridded data in `RasterBrick` object [duplicate]

I have dealt with E-OBS gridded dataset and how to cropped raster grid for a particular country (I used 0.25-degree regular grid daily mean temperature observation). However, I have read about E-OBS ...
4
votes
1answer
92 views

Creating mesh that divides world by same area?

How can I create a mesh that divides the world by the same area? If possible, I would like to create it using qgis and postgres I'm planning to use quadkey or geohash but If you already have standard ...
0
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2answers
71 views

Deriving grid of points from gridded vector dataset using R?

I have a large gridded vector dataset (see extract below) and would like to derive a grid of points centered in each cell of the grid. Is there a way to do this in R?
1
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0answers
462 views

Convert Raster to grid [duplicate]

I want to convert or a raster into a grid. I am with QGIS. I have a raster of a parcel. I have a vector grid of the same area. I want to add in each block of the grid a mean value of the raster. ...
4
votes
2answers
196 views

Uncertainty of a line between two coordinates with uncertainties in QGIS

I am trying to plot the uncertainty of a line between two coordinates with uncertainties. I have created polygons around 2 coordinates to represent the uncertainty region around each point. I then ...
1
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2answers
89 views

Vector layers seem not to be aligned when performing 'union' in qgis

I have two files (shapefiles). A file with 50x50 meter cells. and a grid with 100 by 100 meter cells. I want to do 'union' so that I know which 4 cells of the 50x50 meter vector layer make up one cell ...
5
votes
1answer
539 views

Expanding a grid/fishnet in QGIS

I have two vector layers as seen below, one is a landcover map showing the different habitats in a region and one is a grid of 4 x 4 km squares that covers the region. I have to extend this grid to ...
6
votes
1answer
216 views

Calculating features from one vector layer in another layer (grid)?

I have two vector layers a landcover map showing the different habitats in a region a grid of 4 x 4 km squares that covers the region I have to calculate the percentage of landcover in each grid ...
1
vote
1answer
113 views

Automating select polygons by distance within same layer using QGIS?

I have say, 6,000 polygons roughly 25 acres each, all touching one another, basically a grid but with irregular shapes. Using QGIS, how do I start with one shape then in an automated process, select ...
1
vote
1answer
164 views

retrieving all coordinates of gridded temperature data with its metadata that falls in Germany' polygon?

I have yearly gridded temperature observation for all countries, and I picked up recent 35 years' data for climate research. However, in original data, yearly temperature observation has been stored ...
1
vote
1answer
272 views

Importing back GIS made grid from Excel?

I have the following problem: We created a grid and used it's squares as quadrates with an also attached attribute table. As the working areas were far fom each other, we created different sites ...
3
votes
1answer
116 views

Building fishnet using polygon feature class as center of fishnet?

I'm interested in creating a fishnet where the origin of the fishnet builds from the center of a polygon feature class and builds out around it rather than building the fishnet starting from the lower ...
-1
votes
1answer
324 views

Drawing regular grid over map formed by set of points in QGIS?

By using QGIS, is it possible to draw a regular grid over a surface formed by a set of points, by using an assigned grid dimension (expressed as fraction of degrees of latitude or longitude)?
6
votes
2answers
6k views

Create spatial polygon grid from spatial points in R

I am trying to recreate a map in R. I need 2 by 5 degree grid cells across the contiguous United States, but plotted in Albers Equal Area. The result is a grid with curved lines and slightly variable ...
10
votes
1answer
254 views

Create points at specified distance from each other in random fishnet's cells while being on linestrings

We have a land protocol where we receive a fishnet of 1x1 km cells. Some cells are randomly choosed. We need to put 4 points in each cell and these points have to be on a road too. The minimum ...
0
votes
1answer
190 views

grid data to contours

I have a dataset containing a grid of geo-referenced points that have a corresponding value. I'd like to create geographical areas (polygons) at certain levels within the grid, basically combining all ...
2
votes
1answer
283 views

Using CRS as parameter in QGIS Graphical Modeler

The question is loosely related to Using Calculator in QGIS Graphical Modeler since it is the same model I'm talking about. I have an algorithm ("Create Grid", in that case, but it might be any other) ...
1
vote
0answers
184 views

Calculating built-up density for each cell in vector grid in QGIS?

I have two layers: a raster of India showing built-up areas (black pixels represent built areas) and a vector grid overlaying it. My goal is to calculate the percentage of built-up surface in each ...
2
votes
2answers
105 views

Generate a grid through an extensive area without killing my machine

I need to generate a grid of 10x10m on a certain extent so I can extract only the squares that have some area inside of a certain shape. My problem is that the shape I need to extract those squares ...
11
votes
2answers
12k views

Creating polygon grid using Geopandas

I'm working with a geodataframe of points and I need to create a grid of rectangular polygons. I know how to have bounds of the geodataframe with gdf.geometry.bounds. Now using this information and ...
3
votes
1answer
427 views

How to divide a shapefile based on a 500x500m grid clip areas based on a grid?

I want to divide a shapefile based on a 500x500m grid into a series of individual shapefile using the clip function, each only having the contents of one of the 500x500 areas. May I ask how to do ...
3
votes
2answers
334 views

Bounding box generation, retaining fields?

I generated a bounding box by calculating the extent of each feature using "Polygon from layer extent..." tool located in "Vector/Research Tools" which works great but I lost the fields, especially ...
3
votes
1answer
270 views

QGIS Saving grid to SpatiaLite database efficiency

I wanted to make vector grid in QGIS basing on canvas extent and save it to SpatialLite db. Therefore, I am creating new database: Layer > Create Layer > New SpatiaLite Layer > ... > Save. Then, I ...
2
votes
1answer
58 views

How do i join a polygon's (cell shaped) attribute to another polygon in ArcGIS

I have a grid shaped polygon which includes population data inside every cell (1km*1km) and I'd like to transfer this population data to my other polygon that are the districts of a city to find a ...
3
votes
1answer
242 views

Vector Grid Creates just one grid

Im trying to create a vector grid for my shapefile. I want it to be in meters so I set my CRS to EPSG:32650 UTM 50N. This is what I do exactly I set the layers CRS to that one above, then click on ...
3
votes
2answers
566 views

Need help creating Europe reference grid map using EEA shape and spatialite files

I'm trying to generate a reference grid map of Europe with country and provincial boundaries using the EEA files available here. Here is an example of country and provincial boundaries with a raster ...

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