I am relatively new to qgis. I have GPS coordinates of two types of sites in csv format, (water point site and sanitation site). I wanted to find out if it is possible to create a 100 meter radius on all the water point sites to find out how many of the sanitation sites are outside the 100 meters.
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I'm very new to the GIS world, so my problem could be very stupid, but I'm going to try anyway.  Objective  Given a list of coordinates in longitude/latitude, stored as a .csv file, I want to create a buffer with distance of x km around those coordinates. (In case this is relevant, these coordinates are locations of the societies in the . These societies scatter all around the world.)  Problem  I'm only able to create buffers with distance in radial degrees, but I want to do them in (kilo)meters. I'm aware of the following Q&amp;A's, but following what's suggested therein doesn't seem to solve my problem:          What I have tried...   I start QGIS (v2.4), and Add delimited text layer  choose my .csv file and the x/y fields, click OK select WGS 84 as my CRS (also tried NAD83 but didn't make a difference), click OK right-click on layer and select Save As..., in the dialog box, choose the following and click OK:  add sccs_meter.shp as layer to the current project Select Vector > Geoprocessing Tools > Buffers > set buffer distance as 10   The result is a buffer with radius of approximately 1068km, which suggests that buffer distance is 10 degrees rather than 10 meters.  What did I do wrong here?
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I am currently writing some code to do multilateration using TDOA and currently struggling and wondering if anyone has any reference code that can be used as a test case with some sample data that I have!  At the moment I am unsure if it is the code I have written or whether it is the geometry of the points that is off.  One example group of packets that I have received is  station1 = [50.919149572907784,-1.005043823556842,90.729]; station2 = [50.8304,-1.21956,0]; station3 = [51.0569,-1.26224,100];  stations = [station2,station1,station3]; timestamps = [28704.175275109, 28704.175334203, 28704.175334875];   My code currently locates this to 50.910447339754654,-1.2347406519401736 which I am 99% sure is wrong!  Does anyone have any code that can verify this at all?  One bit of code I am testing against and get very similar results is
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I'm not much of a GIS user, but I've got a big ascii file that I'm trying to convert into a   lat  long  data x1   y1     d1 x1   y2     d2 x1   y3     d3 x2   y1     d4 ... etc   format, so that I can work with it in R.  I've got global national identifier data (i.e.: which country occupies what grid) at 2.5 arc-minute resolution, but I want to coarsen it into half-degree, because that is the resolution of the rest of my data.  I could do so in R if the file weren't so large -- its 3.9GB and I can't read it into memory.  A NetCDF file would obviously be ideal for me, but I can't find a netcdf version of the data I want.  The data is categorical -- country identifiers.  What I want to do is simple to take each 12x12 block of gridcells, evaluate that N=144 matrix, and return the country that appears the most times.  (I'd also like it to ignore NA values, unless all values are NA).  This would be easy enough in R if I could only open the darn text file.  So I opened QGIS, but there doesn't seem to be any obvious way to "coarsen" a raster.    Is there one?    Then it occured to me that I could convert the data to vector, and then convert it back to raster, specifying the resolution that I want.    BUT is there a way to do so that would allow me to specify that each gridcell should be .5x.5 degrees, going from -180 to 180 and -90 to 90?    This seems like a pretty gross hack.    Is there a better way?    I've decided that it makes more sense for me to just make the file into a netcdf using a remote machine with the memory for it.
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I have been trying for a long time to connect a external table data[csv] through Excel (for exmaple) with QGis with the objective to each time i change any data in table(for example data location - coordinates [X ; Y]),this changes occur in QGis real time.  Is there any procedure to get it?.
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I have an Excel file containing data collected over many years as latitude and longitude coordinates for archaeological sites. How can I import it into QGIS as a new layer?
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I am wondering how I can get the distance between consecutive GPS locations in ArcMap 10 (i.e. the distance between consecutive GPS locations sent in during a wildlife telemetry study).
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I have a raster and a vector point file. I need to generate another raster of same resolution showing how many points are inside the corresponding pixels of the original raster.  Something like that:   Is there a way of doing that in QGIS?   I just want the number of points, no attributes involved.
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I'm pretty new to using QGIS and I'm curious about how to import and export GPS points created in QGIS. I have QGIS 2.0.1 Dufour on Windows XP and a Garmin 62s. Any suggested walk throughs would be great.
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I have two classes sharing the same CRS (Latitute and Longitude):   bolognaQuartieriMap: a SpatialPolygonDataFrame containing data of a city boroughts. crashPoints: a SpatialPointsDataFrame containing data of accidents.   They are well plotted using:  plot(bolognaQuartieriMap) title("Crash per quartiere") plot(crashPoints, col="red",add=TRUE)   What I need is to get the number of points (crashPoints) in each polygon that constitute bolognaQuartieriMap. I was suggested to use over() but I did not succeed.
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I have a global map with CRS WGS84-EPSG:4326 and I want to calculate the area of my polygons. From what I read, to change the unit from degrees to meters I need to change my CRS. However, there is no global system for this. Is there any solution to change the unit from degrees to meters for a global map?
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How do I easily calculate the lat/long of points using the QGIS Field Calculator? I saw a previous related question (), but it deals with a more advanced approach. In ArcGIS Desktop this is similar to the Calculate Geometry function; I just can't find where do this in QGIS.
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How do I calculate the distance between two points specified by latitude and longitude?  For clarification, I'd like the distance in kilometers; the points use the WGS84 system and I'd like to understand the relative accuracies of the approaches available.
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I'm working with  that has X Y coordinates. They are akin to '3672187.92698000, 534175.72095400'.  I would like to convert them to longitude latitude so they are more like '-90.097017, 29.963176'.  I've seen this  however I don't have that software. I was able to download and install  but I am unfortunately perplexed by its complicated interface. Would like to do the conversion with it, if possible.
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Does anyone know if it's possible to do a 'one to many' spatial join based on distance in QGIS?  The "Join Attributes By Location" under ->Vector->Data Management Tools is very limited...  Just to be clear, below is how it's done in ArcGIS.
113727
I'm looking for help calculating the distance between a sequence of points that are in a single Shapefile in QGIS.  Below is what my data look like and a blank distance column I've added to show how I'd like the distance to look.  I want to know the distance between point 1 and 2, 2 and 3, etc. I'd like distance to be in meters or Km, but currently my Shapefile is in a projection whose units are decimal degrees.  ID  LAT         LON         TIME        DISTANCE 1   10.08527    124.59833   21:24:37    0 2   10.08523    124.59830   21:25:07    ? 3   10.08526    124.59832   21:25:37    ? 4   10.08526    124.59831   21:26:07    ?   A number of people have asked similar questions, but none quite get at what I want to do.  This post is close, but this is in PostGIS, not QGIS    This post got me part of the way there, but since I'm new to QGIS the answer doesn't provide enough detail for me.  For example, once I've installed the GRASS plugin, I think I need to save/import the Shapefile with my series of GPS points into GRASS so I can use the v.distance module, but I don't know how to do that.       Is the GRASS v.distance module the only way to go?  Or is there a more straight forward way?  If v.distance is the only way would someone be able to point me to or explain more step-by-step how to do this?
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My question is about extracting values from rasters at the location of points. With the function extract this is very easy, and the function gives me a dataframe with the values of all the variables in the points. I want to have in that dataframe the coordinates of each point. How can I make that happen? Is it possible to say to R that when extracting the values from the raster also add the columns of the location point.  This is my procedure:  presencias=read.table("c:/SDM_R/presencias/P_lentiscus_pres.csv",header=TRUE,sep=";")  lista_variables &lt;-list.files(path="Variables_modelizacion/solo_ascii",pattern='*.asc',full.names=TRUE) variables &lt;- stack(lista_variables)  variables_presencia&lt;-extract(variables, presencias)   the results are something like these:  &gt; bio1  bio12  bio18  bio2  bio4  &gt; 90    875    165    95    4886 &gt; 115   1085   158    83    4075 &gt; 135   1153   153    67    3402 &gt; 85    1026   137    99    5203 &gt; 96    667    128    108   5823 &gt; 98    531    109    113   6305 &gt; 132   450    63     123   6598 &gt; 132   569    104    106   5963 &gt; 95    814    196    98    5571 &gt; 146   474    39     114   6603   But I want two more columns with the coordinate data (but could be others columns from my csv extracting location table).  Thank so much.
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I have a CSV file which has postcode data in a field, but it is non-spatial e.g. no Easting and Northing.   I have a shapefile with postcode in a field and some additional data.  I want to join the CSV with the shapefile based on attributes (postcode fields). I know I can do this in ArcMap, but how can I achieve the same thing in QGIS?