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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44 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 ...
2
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0answers
12 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
30 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
59 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 ...
2
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1answer
36 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 ...
6
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1answer
206 views

Creating a 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 grid A ...
6
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1answer
90 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 ...
6
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1answer
106 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 ...
4
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2answers
112 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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0answers
24 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 ...
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1answer
184 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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0answers
29 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
42 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
33 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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0answers
35 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
40 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
36 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
47 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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0answers
26 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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1answer
65 views

Create a vector line in the middle of two lines (grid) 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 ...
4
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0answers
93 views

Generate global grid of circles with minimum overlap with PostGIS

I want to generate a table of geometry points in PostGIS which represent the centers of circles, each with the same radius of X meters, that together form a "grid" that covers the entire ...
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1answer
55 views

How to convert grid to vector in SAGA?

I need to convert raster to vector, I have data from a field in two layers. In the first i have DSM (digital surface model) and DTM (digital terain model) in the second layer. Based on difference in ...
2
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0answers
28 views

Adding colour range to grid in QGIS

I am doing some mapping for vegetation monitoring across a site. I have divided the property up into quadrats using the create fishnet grid function at the size I wanted. I have then intersected it ...
2
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1answer
63 views

R fractional area calculations using the exactextractr package

I have a question related to this question. I have a gridded shapefile, which has 256 grid polygons. This shapefile represents an area of interest, and that area of interest also has a raster. I want ...
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0answers
28 views

Fishnet cell size accuracy [duplicate]

I have a raster of 500m resolution based on MODIS sinusoidal projection, so I first converted it to WGS84. In order to create a 500m fishnet of the WGS84 raster in ArcGIS, I first converted the raster ...
2
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2answers
63 views

“Zonal statistics” for two polygon layers using ArcMap

I have 2 polygon layers: one is a vector grid with attribute values for each "polygon cell" the other including administrative boundaries I would like to calculate the mean value of all ...
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0answers
24 views

Calculating how many acres fall within each 1 square mile section?

I am using ArcMap. I have a polygon shapefile of parcels that receive surface water from a water district. I also have a polygon shapefile of section boundaries. I want to calculate how many acres ...
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1answer
44 views

Is it possible to convert the USNG grid to a perfect square 10mx10m fishnet at CONUS scale?

I realize this is a ridiculous question, so please forgive in advance. Would it be possible to generate a 10m x 10m grid at CONUS scale, without any non-square polygons at the Grid Zone Junctions (...
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0answers
54 views

Pixel height and width in degrees

I am planning to create a NetCDF file from a script (Github). My shapefile is in GCS_WGS_1984 (this is one of the required files for the script). Now, the script requires to define the cell/pixel ...
3
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1answer
67 views

Creating grid with squares on same line

I have created a grid, which I want to use in an ArcGIS Online application. To create the grid (fishnet) I have used the local projection, which is in meters. I avoided using WGS84 as it is in degrees ...
3
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1answer
96 views

How to Create a Custom-shaped Fishnet Grid in QGIS

I am looking to automate the create of a fishnet grid over a large area (about the size of Rhode Island) for a mapping study. I want to use hexagonal grid cells, but the kicker is I need each of these ...
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1answer
56 views

Extending vector grid in QGIS

I created vector grids in QGIS of size 2*2km. Now I have to add few more grids of the same size to these existing grids. Is this possible in QGIS?
0
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1answer
34 views

Splitting up polygon with grid using QGIS

I am using QGIS. I have a county map as a single polygon, it has one FEATURE in which one FIELD is Area. I have a grid which also a polygon that divides the county into squares and each grid square ...
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0answers
23 views

How to quickly turn regular spaced points into a grid?

I'm looking for a quick way in ArcGIS Desktop or Pro to turn a set of regular spaced points into a grid like shown here Currently I am creating a fishnet first and then conduct a spatial join but I ...
2
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0answers
30 views

Aggregate polygons into specific shapes [closed]

So, I've basically got what amounts to a vector-based raster set. It's a series of regular-sized squares that, for all intents and purposes, are raster pixels. The only reason it isn't a raster is ...
1
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1answer
24 views

ArcGIS: Selecting features from a grid layer which are on the edge of another feature by location

I have two layers which come from the same data source. The first one is a vector grid layer which contains 1km x 1km features and looks like this: The second one is the grid layer dissolved into Sub-...
0
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1answer
28 views

Extract by mask with grid shapefile in ArcGIS Pro

I have a tiff file. I want to extract it by a grid but every shp cell should clip the tiff file to a new tiff file. Perhaps the attached image could make sense.
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1answer
82 views

Ortho Grid in QGIS straight and curved

I'm really new to GIS tools. I'm trying to make ortho projection maps of all the countries. I've downloaded Natural Earth Data and QGIS. I imported the data files by dragging them into QGIS. I added a ...
0
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0answers
15 views

Zonal statistics projected differently ArcGIS Pro 2.5

I have a fishnet of equally sized raster cells of 1/4 degree, which spans the whole world. Furthermore, I have a netCDF file containing precipitation data. I load both, the shape and the raster file, ...
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0answers
32 views

Creating grid in QGIS representing trial plots

I would like to create a grid in QGIS. This grid shall represent agricultural trial plots (each plot about 4,5 x 10 m). Digitizing each polygon is time-consuming and not very exact. Is there a simple ...
0
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0answers
36 views

Calculate Percentage population from Vector Grids

I have a vector grids layer of population (shapefile). Each grid represents population in that grid and have the following attributes: Area Population I want to calculate and display the percentages ...
1
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1answer
32 views

Different number of grid cells between years when using a grid layer to look at area of land cover change over time

My goal is to calculate the area of mangrove cover (vector layer) per grid cell (vector layer) over time (yearly), to determine land cover change. I have tried two ways so far. Initially I wanted to ...
1
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1answer
27 views

Assign coordinates to grid-cell in QGIS

I've created a grid using make grid in QGIS. The type of grid is rectangular (polygon) and it's 0,1 x 0,1 decimal degrees. I now want to assign an X and Y coordinate to the centre of each grid. Would ...
0
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1answer
106 views

Matching points to grid-cells - using join attributes by location

I have point data in a shapefile covering most of Africa. I've made 0.1x0.1 grids using the make grid option from QGIS and now I want to link the grid_id to my point data. Below you will find a ...
0
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1answer
81 views

Cannot run “Create Fishnet” tool in ArcPy

I've been trying to run an ArcPy code which creates a fishnet for sampling. Everything in the code works fine, but when it gets to arcpy.CreateFishnet_management(), it stops running. I've already ...
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0answers
29 views

Turn a grid an place

I have a grid over a rasterlayer and a second a line .file. I want to place the grid paralell to the line shape or dock it on the shape file. I tried it with turning the grid manually, but it takes ...
0
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1answer
38 views

Make fishnet visible but not snappable [closed]

I'm currently using a polyline fishnet grid to use as a guide when labelling land features. For example, I aim to label 10 grids per day. An issue I have is that when creating my polygons they keep ...
2
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2answers
51 views

QGIS 3.12 print composer - how to rotate map but keep grid unrotated?

I am creating a map using QGIS 3.12 and wish to rotate the map and add a grid using print composer, but I want to keep the grid unrotated. Is this possible or does the grid only rotate with the map?
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0answers
57 views

Converting a 2x2km point grid to a coincident 1x1km grid

I needed to convert a 2x2km point grid (specifically the LUCAS grid) into a coincident 1x1km grid. Is there a "simple" way of doing this in QGIS?
1
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1answer
37 views

Getting polygons out of .shp

I have a shapefile with lines. In the attributes of the line shapefile I have known coordinates. I want to get polygons out of these points which reach to the next line. As a goal I want a grid out ...

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