Geographic Information Systems

Questions tagged [vector-grid]

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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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29 views

Replace values by nearest value

I have a vectorised meteorological dataset containing both precipitation and temperature for variables. This has been merged with a larger polygon however I have some NULL values in the field for ...
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38 views

Spacing error when creating vector grid in QGIS

I'm trying to create a vector grid in relation to a commune's right-of-way with the "create a grid" tool in QGIS 3.16. I would like the grid to be created at a certain scale. In the tool ...
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1answer
22 views

QGIS 3.16 :Vector grid number generation

I would like to number my grid cells from Northwest to Southeast. I tested a formula in the field calculator found in this post: Vector grid id generation. But the problem is that I would like to have ...
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2answers
122 views

Calculating average data of neighbour grids based on location and returning data to grid in QGIS

I have generated a grid layer from a vector layer in QGIS, and merged the point attribute into the grid layer by "joint by location". I now need to: calculate the average of some ...
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1answer
36 views

Creating grid cell and associating to each row (point) by the cell id

I have the following data in CSV: latitude and longitude of the geolocation of violent events, where they occurred, which actors where implied, etc. Each row is a different event with a different ...
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1answer
32 views

Aligning rectangular grid with raster pixels in QGIS

I want to create a 1000m grid over a 1000m land cover map such that the grid cells are perfectly aligned with the raster pixel underneath. But when I use the Create Grid function in QGIS, the cells ...
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1answer
33 views

UTM grid layer in Garmin GPS

I would like to ask if someone could point me in the right direction. I need a UTM grid (1x1km) layer in Garmin handheld GPS, so the UTM grid would show on top of the map. The grid layer should be on/...
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19 views

Finding average value from polygon areas in fishnet cell based on lat/long of points using ArcGIS Pro

I have created a fishnet of 0.5x0.5degrees and wanted to know the average lat/long in each cell in ArcGIS Pro. How could I accomplish that?
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1answer
23 views

Joining polygons to points returns no rows?

I'm trying to join a 1000m fishnet grid to a layer of points, so that for each point I can find out which grid cell the point lies in. Both the grid and points layers are saved in a file Geodatabase. ...
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15 views

QGIS merging grid cells together changing resolution from 250x250m to 500x500m [closed]

I want to change the resolution of a grid in QGIS and can't make it work. I have checked the site for similar problems but couldn't find a simple and good solution. My Grid looks like this: and I ...
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15 views

Using R to overlay a fine resolution grid on top of a coarse grid and for the fine grid to adopt the values from the coarse grid below

*When I refer to climatology here I am referring to a thirty year timeslice which is averaged monthly to produce a climatology (year of average data) for a specific variable. I have a high resolution '...
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44 views

QGIS Grid size accuracy

I am using QGIS. I have been using "research tools/create grid" during my process to generate XY coordinates for field research. Using opentopomap for map layer. Using shapefiles. In the ...
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2answers
87 views

Giving grid cells unique ID of numbers and letters by rows and columns

In QGIS 3.16 I have a grid made up of c.900 squares and I want to give each square in the grid an individual name. I want rows to be numbers and columns to have letters so when they meet that is our ...
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26 views

Script that creates a score based on location of rasters

I have six rasters showing different things, such as elevation, temperature, etc and a grid with a size of 1 acre/cell. The grid feature class has six fields, each named "coverage_temp, ...
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14 views

How can I create an indexed grid from a WMS service, with each element being the same size in pixels (512x512 for ex)

I understand how to make a fishnet-type grid (Vector->Research Tools->Create Grid), but this has definition via degrees, resulting in varying element sizes. I further can't see a way to index ...
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2answers
80 views

Create a database of the world divided into .25km squares

I would like to build a database of GPS coordinates spaced out .25km over all of the land in the entire world. It's a discovery project for a client that wants to perform visualization and I'm not a (...
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19 views

Minimizing buffer error

I got a vector layer, that I would like to buffer in Rectangles (resembling a Raster layer). However, when I buffer the vector points, there always is an error in the buffer (see picture) I am pretty ...
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2answers
91 views

How to calculate values through nested grids in QGIS/GeoPandas

Problem: I have a series of nested grids. Example is below. I want to perform calculations for the smallest grid (grid with the smallest cells, green here) based on the values in the upper cells ...
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1answer
80 views

Computation of a point location in QGIS

I created grids (A1, A2....,B1,B2,...etc.) in print layout (main properties-grids). I also use atlas. I display many points and I need to calculate location of every point within a page of atlas and a ...
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23 views

Point cloud data on a grid

I have a point database marking different locations (presence of an animal) on a grid of 250 m x 250 m over a certain period of time. Each one of these points have a date. By intersecting the grid ...
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1answer
39 views

How do you automatically number cells in a grid with row numbers and column numbers (or letters)

I have a fishnet grid consisting of 330 rows and 330 columns. Each cell is 500 feet x 500 feet. The centroids of each cell is 500 feet from its adjacent centroid throughout the grid. Also, the ...
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1answer
59 views

Adequate CRS when creating a grid over a whole continent in R

I'm trying to generate a grid of 6.72 km by 6.72 km points over the whole continent of Africa, but I'm having a lot of trouble in doing so. I'm mainly running into 2 problems: My first issue arises ...
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48 views

Incorrect measurements in QGIS

I am using the Create Grid tool in QGIS to simply create a 25x150ft grid. I am using EPSG:3857. When I select my parameter I want and run the tool, I double-checked the dimensions with the measurement ...
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2answers
72 views

How to construct a grid over a given position from polygons?

I have the following situation: I have a MultiPolygon Layer that shows some squares with the size of 100mx100m. The data looks like a raster: I want to construct a grid with the size of 100mx100m (...
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69 views

Layer ordering of ST_ASMVT tiles in Leaflet

I am generating MVT tiles for multiple layers in Django using the following query: WITH bounds AS ( SELECT ST_Segmentize(ST_MakeEnvelope(8247861.100083642, 3551570.082242422, 8252753....
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20 views

QGIS Grid naming different [duplicate]

Is it possible to name a GRID with letters and also not from top down but from left to right?
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1answer
58 views

Removing grid from showing up in shapefile

I am pretty new to QGIS. I have the following result generated (map shown). The issue I am having is I am not sure how to get rid of gridlines inside the map in a manner that it just shows the outside ...
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3answers
80 views

Creating grid from 4 sided polygons with equally divided facing sides using FME

I have a set of polygons, each one comprises 4 sides. Each facing sides are equally divided into segments (right figure). Is there anyhow to automatically create a grid as shown in the figure on on ...
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15 views

How to overlay vector grid to keep track of areas I have reviewed:ArcMap

I need to review large areas at the street level (in ArcMap) to make sure certain features are up to date. Is there a way to overlay a grid so I can "check off" areas I have already covered? ...
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1answer
72 views

What are default units for coordinates in Create Fishnet tool of ArcGIS Pro?

This has been a reoccurring issue for me using ArcGIS Pro - when creating a fishnet and specifying the extent from an existing layer and subsequently trying to set the cell size, I am getting a ...
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1answer
100 views

Getting coordinate grid per country

I need a coordinate grid per country, 0.08 degrees (?) apart from each other. It looks like this: I would want the coordinates of the intersections. Instead of a perfect rectangle, I would want it to ...
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1answer
38 views

Creating world grid with fix number of row and columns without overlap using shapely and geopandas

I'm trying to build a grid over the world and cut it on an AOI. The initial grid have non trivial properties. It is a grid of squares in EPSG:4326. The dimension is not round, they simply cut the ...
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1answer
82 views

Creating a grid from pixels of a georaster in Python with GeoPandas

Let say we have a georaster file with a given resolution. Is is possible to create a grid where each cell of the grid correspond to each pixel? Is it possible to store this grid as a GeoPandas ...
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1answer
79 views

Creating grid in QGIS 'anchored' to specific point

I need to create grids using QGIS with specific intervals 'anchored' to, or beginning at, a specific UTM coordinate. This is for a survey sampling procedure. For example: a point was determined - UTM ...
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1answer
48 views

Understanding “create-grid” output and getting grid points' coordinates

I created the following grid points by using the "create grid" pluggin from the processing toolbox, then "Intersection" to clip from a mask. My idea was to calculate the ...
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1answer
295 views

Creating nested grid in QGIS

How can I create something like this as a layer in QGIS? I currently have one large Grid set with "ID"s, and I'm wanting to create nested layers of 5 x 5 grids 5 levels down. (so for example ...
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1answer
105 views

Placing point over pixel with maximum value falling in grid overlay using QGIS

I have a raster layer with a Shapefile grid with cells measuring 3 x 3 m overlaid on top. All I want to do is find the pixel with the maximum value within each cell, and place a Shapefile point over ...
7
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1answer
163 views

Creating grid with PyQGIS

I cannot create correct grids with PyQGIS. When I create grid with PyQGIS, the grid shape is not correct, i.e. rotated grid. But it's correct when I create it with QGIS > Vector > Research Tools ...
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2answers
285 views

Using ST_SquareGrid to create grids

In PostGIS 3.1 the function ST_SquareGrid(size, bounds) generates a grid. The documentation for the functionality is available in the docs. Understanding how this is done is not clear from the ...
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27 views

Retaining Bounding Box after Fishnet Clip

I have a large image that contains around 7000 trees. I created a bounding box around each one of them and then saved it as a .xml file. I would now like to create different fishnet sizes and clip ...
3
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1answer
554 views

Convert Polygon to Multipolygon with GeoPandas

I'm trying to create a vectors grid from a single geometry, from PostGIS's table to another PostGIS's table; both tables are in the same DB. The input geometry is MultiPolygon and I've previously ...
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39 views

Exporting slope values from DEM-derived rasters to CSV from QGIS [closed]

I want to export the slope values with their corresponding latitude and longitude into a CSV file. There's a DEM of a region having an irregular shape (not square). I have to generate the slope rate ...
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1answer
51 views

Does symbology work on grid layers?

I'm using QGIS and I created a grid and joined a column with observation points to it. I'm trying to use symbology to shade the cells of the grid based on the values that I joined. But it looks like ...
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1answer
57 views

Is there a way to merge a grid with a shapefile?

I'm using QGIS and I have a shapefile that's a grid I created and another shapefile that is points. I would like to join them so each grid section is linked with points that fall within in. The grid ...
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63 views

Why is 'Count Points in Polygon' returning zero values for all NUMPOINTS?

I'm using QGIS and I have a file of points (Coyote_Clipped). I'm trying to count the number of points in each grid cell. I ran "Count Points in Polygon" on the grid and it worked without ...
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1answer
87 views

How do I lay a grid and count the number of points within each sector?

I'm using QGIS and this represents a metro area that is 3,965 square miles. I want to lay a grid over it and measure the number of points in each sector. I haven't used any of the grid tools before ...
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1answer
75 views

Convert st_make_grid object to shapefile

I've created the following grid: my_grid_geom = st_make_grid(CLC18, cellsize = 0.4) my_grid = st_sf(geom = my_grid_geom) plot(my_grid) I would like to convert this grid now into a shapefile for ...
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1answer
56 views

Vector Grid creation ERROR

I am trying to create a grid in QGIS and keep getting a error saying "Horizontal Spacing is too Large for covered area". I'm trying to create a 63.93m x 63.93m square grid. I am using the ...
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32 views

QGIS / “create grid” consumes far more memory on linux than on windows

I am using QGIS 3.10 both on windows and on Linux with the same RAM and CPU resources. When running the tool "create grid" QGIS behaves strange on Linux: For a certain extent (~ 10x10km), ...
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3answers
122 views

Creating vector line in the middle of two lines (grid) in QGIS 3.16

I have a grid. I want to create a new line in the middle of two lines. For example, calculate the distance between line 1 and 2 and create a new line (the red line in the image) exactly in the middle ...

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