Even if I love QGIS, sometimes there is a better tool for certain GIS
jobs. In this case: *ogr2ogr*, which is a command-line tool that's
included in the QGIS distribution.
Do the following (I assume you want to make a shiny new geopackage file
instead of old fiddly shapefile):
* Create a directory in which to save the geopackage. Let's call it :
*c:\data*
* Create a text file with the following content:
ogr2ogr -f GPKG c:\data\census.gpkg -nln census -nlt PROMOTE_TO_MULTI
/vsizip//vsicurl/https://www2.census.gov/geo/tiger/TIGER2019/TRACT/tl_2019_01_tract.zip/tl_2019_01_tract.shp
FOR %%G IN (02,04,05,06) DO (
ogr2ogr -f GPKG c:\data\census.gpkg -nln census -nlt PROMOTE_TO_MULTI
-append -update
/vsizip//vsicurl/https://www2.census.gov/geo/tiger/TIGER2019/TRACT/tl_2019_%%G_tract.zip/tl_2019_%%G_tract.shp
)
* save it as: *c:\data\cc.cmd*
* start program "OSGeo4W Shell" it's located in same program group as
QGIS 3.12. It will start**a dos command shell.
* in the command shell: type: *call **c:\data\cc.cmd*
* Voila! the cmd file will create a geopackage c:\data\census.gpkg
that contains census tracts 01, 02, 04, 05, 06
* You can extend the number of census tracts by extending the
linepart: 02,04,05,06 with (example)
02,04,05,06,08,09,10,11,12,13,15 etc.
* This www page *https://www2.census.gov/geo/tiger/TIGER2019/TRACT/
*has a list of all available files. The available numbers is between
01 and 78
* The file names and www addresses can off course be changed to other
values.
Den 12-04-2020 kl. 20:07 skrev Mark Fogarty:
hi. i'm new to the list and qgis, apologies if this has been asked. we're
working with the us census tract files available from census.gov here:
https://www.census.gov/cgi-bin/geo/shapefiles/index.php?year=2019&layergroup
=Census+Tracts
they are published as 54 separate zip files, one per state. we would like to
combine them into a single dataset. i found a lot of pages on the web that
suggest using qgis for that purpose. they all start with
Click on the Vector menu, Data Management tools, Merge Shapefiles to
One...
i just installed qgis 3.12.1, but my vector / data management tools menu
doesn't have that option. has that tool been removed, or is there a plugin i
need to install or maybe a different version?
is that data already available in a combined format from somewhere, or is
there a better way to do this?
thanks
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--
Med venlig hilsen / Kind regards
Bo Victor Thomsen
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