[GIS] How to create correct vector grid in meter

createqgisvector-grid

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 didn't find a good solution. Here is what I tried:

Using the research > vector grid tool: I always fail to have the right X and Y Values, it is never 100m, even if I have "m" as my default length.I need 100m but it says always something around 59,… if i measure it with the measurement tool. and also the vertical length seems to be slightly bigger than the horizontal length.
Using processing tools: create grid – I have the same problem with length.
Using the MMQGIS create Grid tool: Same problem as 1 and 2.

how can I change the way i calculates distances? I think I have to look somewhere else, but dont know where.

FYI: Running system is Win 8, 64 bit, QGIS Version 2.4,

Best Answer

Any rectilinear CRS (coordinate reference system) will do--if the units are in feet you can just convert to meters. When you use a geographic projection the units are in degrees, which is what is screwing you up. spatialreference.org is a good source for information on different CRS's... I'd pick one out for you but I don't know where your focus area is.

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[GIS] How to emulate a specific vector grid in QGIS

Most probably your project CRS is set to default WGS84, that is lat/lon degrees.

You better set the project CRS to that of the Geotiff you created. Then the values for vector grid are in the units of the CRS. You can select min and max values to the ones you need, either by taking the values written on the map, or moving the mouse to the lines and noting the coordinates from the infobox.

And make sure to create polygons, not lines. Otherwise your grid gets skewed up if you wish to change the project CRS.

[GIS] Create grid from raster with equal size squares

I'm thinking you might have not specificied the exact number of rows and columns and that it created the fishnet best on the area of coverage. ArcGIS resources provide "How Create Fishnet works" which gives a good overview of the tool and the parameters to work with.

Creating a fishnet requires three basic pieces of information: the spatial extent of the fishnet, the number of rows and columns, and the angle of rotation. There are a variety of ways to specify this basic information. For example, you might not know the exact number of rows and columns, but you do know that each rectangular cell must be exactly 110 meters by 63 meters and must cover the spatial extent of another feature class.

The tool has 11 parameters, and you should think of these in four distinct groups:

The spatial extent of fishnet
The number of rows and columns and height and width of each cell in the fishnet
The angle of rotation for the fishnet  
Parameters that define the output feature class name and type

Best Answer

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