[GRASS-user] Spatial data exchange formats

[Daniel Victoria]

Hi Rich,

Looks like I confused things a bit.

ESRI ArcINFO used two formats that spreded files into a directory with the
layer name and another directory called INFO. In the directory with the
layer name, the files had the .ADF extension you mentioned in the first
email. But their content is different.

>From the list you sent, you have a file named hdr.adf, which is a giveaway
that we are dealing with an ESRI GRID (raster format). The presence of a
.OVR file also indicates that it's a grid, OVR being the raster pyramid
overviews.

So, if you have a Raster product, it means that the person providing the
data took care of the processing to generate both the bare earth model and
the highest hit.

Anyway, you can use r.in.gdal to import those GRIDS into GRASS. Just point
to the hdr.adf file and all should be OK.

Cheers and sorry for the confusion.
Daniel

PS - Some references explaining both ESRI formats
http://desktop.arcgis.com/en/arcmap/10.3/manage-data/raster-and-images/esri-grid-format.htm

http://desktop.arcgis.com/en/arcmap/10.3/manage-data/coverages/contents-of-a-coverage-workspace.htm




On Thu, Jun 21, 2018 at 11:50 AM Rich Shepard <rshepard at appl-ecosys.com>
wrote:

> On Mon, 18 Jun 2018, Daniel Victoria wrote:
>
> > You are correct about GRID being a raster format in ESRI world. But from
> > your description, I believe what you have is a coverage, which is ESRI
> > vector format for ArcINFO (shapefile being another vector format).
>
> Daniel,
>
>    What information can I provide that clarifies the format in which these
> data were delivered so I know how to import them?
>
>    A couple of years ago I downloaded LiDAR data from the same state agency
> and that was provided in .gdb format. When I imported the files I had
> clouds
> of data points for bare earth and highest hits. Why the newer data are in a
> different format I've no idea. The agency tells me they'll sell the point
> cloud data, but my project budget has no provision for buying data.
>
>    Attached is a list of directories and files for the 2014 LiDAR data
> flights. I need to learn how to import these and use them to create bare
> earth and highest hit DEMs useful for hydrological modeling. Help from
> those of you who focus on spatial analyses with grass is needed. If I can
> provide more information, such as specific files, tell me and I'll provide
> them. (The entire directory compressed using xz is about 165M.)
>
> Regards,
>
> Rich
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