Is there a way to geo-reference labels alongside the points in the shapefile in QGIS? Usually this would not be necessary as labelling in print composer works just fine, but in this case I need to transfer the entire shapefile (points and lines along with labels) into CUBE
You may use the $x and $y formulas in the attribute table.
But first, you have to check your coordinate system. For exemple, if I have a project in Lambert-93 (RFG93), I add two new columns in the attributes table and apply the formula $x and $y to each of them : my points have now labels with longitude and latitude.
Related
I have merged four different layers into one new one in QGIS, but I want this layer to have different information then the old layers. I want all the buffered 'islands' to have a different ID and a calculated area. However, now in the attribute table I just see four features, one for each layer that I merged. Is there a way to update the attribute table to consist of new features (one for each 'island')?
This is what the layer looks like:
And this is what the attribute table now looks like:
And this is what I want (the 5th and 6th column especially):
You must create a feature for each monopart geometry, you can achieve this using the 25.1.18.46. Multipart to singleparts tool, and then use the field calculator to get the area, you can find here how to calculate area Calculating polygon areas in shapefile using QGIS.
I would appreciate knowing how I can convert the cell values given after the OpenFOAM solution into the ones on the grid points. Is there any direct command for such a thing or I should work with the sampling option?
Thanks a lot for your help.
When you open your case using Paraview/paraFoam, then the interpolated fields at the points (nodes) are already computed by Paraview:
Fields with an orange small circle are the point data, while the fields that have an orange cube icon are the data at the cell centers, i.e:
You can also see the values of the fields (points or cell) using the Spreadsheet view and export them as CSV:
I have an existing map of ward in Chicago in Tableau:
I have a separate CSV file, linked to primary data source by Ward. It contains pairings of Long/Lat points. I can make a map of it by itself, but cannot find a way to place the points on this map. How would I do that?
If you want to overlay the dots to the existing area map you will need to use dual axis. Steps to follow are:
drag latitude (or longitude) from the csv datasource to rows (or columns); this will create another map
right click on the newly added measure and select "Dual axis"; this will overlap the two maps
in the marks box on the left you will be able to select different display settings for the two axis you will then have
You can also find a nice tutorial here
The Situation: I have a vector data map with all the countries in the World, including a unique landcode for every country. I need to convert it into a raster map, so I can eventually analyse (with Matlab) drought indicators for that country.
The Problem: The precipitation data I use has 720 columns and 360 rows. I want the raster map of world countries to be in the exact same amount of columns and rows. BUT the raster map also needs to have a cellsize of 0.5! Right now, when I use the vector to raster conversion tool, if I use cellsize = 0.5, the columns and rows become 720x287.
Question: How can I create a raster map of 720 columns and 360 rows, while setting cellsize at 0.5?
Thank you in advance!
Additional info:
Using ArcMap 10.4.1 and Matlab R2015b
Raster is .TIFF
Vector is .shp
As a fellow GIS user I would recommend posting your question under the GIS stack exchange, https://gis.stackexchange.com/
Beyond that there is some clarification needed. Are you saying that you are trying to create a multi band raster with 1 band for each column?
I solved the problem. In ArcMap, I imported the precipitation data (NetCDF). It was however flipped, but I could get it in the right orientation using the tools 'Flip' and 'Rotate'. Now this map had the right orientation and the right amount of columns and rows. Furthermore I just altered some of the default settings in environments: 1) I set the processing extent to the precipitation data. 2) I set the snap raster also to the precipitation data. 3) I set the cellsize of every output raster to 0.5. Finally, I converted the vector file of world countries to a ASCII file using the raster to ascii conversion tool. The ASCII file now has the same amount of rows and columns as the precipitation data!
I need to do the opposite of clipping down a raster in Qgis (or Gdal, Python etc - even R if someone can provide the script).
I have a dataset from Open StreetMap (*.OSM) which includes the south west corner of a country. I have also converted this to a SHP file or Raster format).
To match with my other Maxent datasets I need to expand the OSM data south and west so I am only increasing the 'no data' areas at the left and bottom of the files.
Is there a way to do this in Qgis?
This process worked for me:
http://ssrebelious.blogspot.co.uk/2012/09/raster-extent-modification-using-qgis.html
"In QGIS you can change extent of the rasters. Lets examine one of the worst case scenarios. There are two overlapping (one band) rasters A and B. Say, we need to add A values to B values and get the final image to have extent that will contain both images."