Great, thanks for sharing ! Le sam. 12 mars 2022 à 10:43, Bernd Vogelgesang <bernd.vogelges...@gmx.de> a écrit :
> Hi Mike and list, > > I took the challenge and so far succeeded at the very moment. Mike sent me > a (not so clean list) of species and counties. > > My idea was to produce an atlas. (Actually, it should be made by a report, > but since those are a bit quirky still, I went the pure atlas way) > > It's a bit hacky, a more straightforward way would be nice. > > - cleaning the data and importing them (table species/county, county > polygons) > > - create table of individual species (toolbox "Delete duplicates by > attribute") -> 101 unique species > > - Setting up a relation between county layer and species/county-table on > the county name > > - new text field in county layer "species" : > > relation_aggregate('name_of_relation', 'concatenate', "species_names", > ',') > > this creates a comma-separated list of species for each county polygon > > Prepare Atlas > > Coverage layer: (fake coverage, as it does not move) > > - create bounding box of the county-layer (Extract layer extent) > > - take list of individual species and add the geometry: retrieved the wkt > of the extent in the field calculator -> "Geometry by expression": > geom_from_wkt('Polygon ((355937 4117435, 782844 4117435, 782844 4498773, > 355937 4498773, 355937 4117435)') > > -> 101 extents with species name as atlas coverage > > - create new map layout > > - Activating atlas, setting species name-field as page name > > - duplication of the county-layer and setting up a rule based style: > > visible: array_contains( string_to_array( "species_names",','), > @atlas_pagename) > > invisible: else > > this query will look for the pagename (= species name) in the array of > species names in the county polygons, and if the name is in, then the > polygon is shown in grey, alse transparent. > > add text field @atlas_pagename > > set atlas output filename to @atlas_pagename > > Export atlas as images > > DONE > > Question: is there a way to aggregate the species per county without > setting up that relation beforehand? This is an extra step which would be > nice if it could be circumvented by some cool function. > > Any ideas or comments? > > Am 12.03.22 um 10:04 schrieb Jésahel Benoist via Qgis-user: > > Hello Mike, > > I tried to follow your question and the most I read the less I understand ! > Could you simply explain what you want to see, what action the user have > to do and what he gets? > For this, try to give input data and what will link them : plants (table > with plant name and states distribution?), states (geometric data with > states names?), columns to link... > The good point is that I'm sure QGIS can do this. But nobody will engage > work if objective isn't precise enough. > > Regards, > > J. B. > > > Le ven. 11 mars 2022 à 21:50, Mike Breiding - Morgantown WV via Qgis-user < > qgis-user@lists.osgeo.org> a écrit : > >> I had the range USA range map in the screen shot and have since updated >> it. https://photos.app.goo.gl/ktn5quT6s6SRwrzBA >> WV-Mike >> ------------ >> On 3/10/2022 11:04 AM, chris hermansen wrote: >> > Perhaps others are better understanding how you want to visualize the >> > distributions, but what I get from your description is that if you have >> > 100 (or 2500) species then you will have 100 (or 2500) maps, which >> > sounds unwieldy to me. >> >> I neglected to mention the use for the distribution maps. >> They will be used in a print brochure. >> A page mock up can be seen here: >> https://photos.app.goo.gl/ktn5quT6s6SRwrzBA >> >> The USA distribution map in the mock up was made in Qgis using the >> information from: >> https://plants.usda.gov/home/plantProfile?symbol=BODI2 >> >> This is interactive and will display down to the state and county level. >> However, they are not up to date at the state/county level. If they were >> I would simply make a screen shot and that would be the end of it. >> >> The state distribution map used in the mock up was made using Qgis based >> on data from the West Virginia University Herbarium which has the most >> up to date information on distribution. >> >> WV-Mike >> >> >> >> _______________________________________________ >> Qgis-user mailing list >> Qgis-user@lists.osgeo.org >> List info: https://lists.osgeo.org/mailman/listinfo/qgis-user >> Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user >> > > _______________________________________________ > Qgis-user mailing listqgis-u...@lists.osgeo.org > List info: https://lists.osgeo.org/mailman/listinfo/qgis-user > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user > >
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