Allow downloading data directly from the cesium map

NCEAS / metacatui

MetacatUI: A client-side web interface for DataONE data repositories

https://nceas.github.io/metacatui

Apache License 2.0

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Allow downloading data directly from the cesium map #1889

Open robyngit opened 3 years ago

robyngit commented 3 years ago

In the current (dev) version of the cesium map, there is a link shown in the layer details panel that leads to a configured url where a user can download the source data. We discussed the idea of allowing users to download a portion of the visible data directly from the map, for example:

Allowing users to draw a rectangle (or other shape) around an area of interest, and download all visible data in that area
Clicking to select multiple tiles on the map, and downloading data from those tiles.

robyngit commented 1 year ago

Here is a quick mockup of how this feature could look: download

mbjones commented 10 months ago

We also could expose a WMTS URI for that download area, so that someone could access the dataset in their GIS of choice without directly downloading it all at once immediately. This would probably require a base WMTS document for a set of layers, that is then constrained to a spatial region chosen on the map.

robyngit commented 10 months ago

We could also include a citation with each download

mbjones commented 8 months ago

Need to consider how the user indicates which data format and what resolution of data to access from a given area of interest (AOI) or set of tiles. For example, if the view is set is at zoom level 7 for a dataset layer that includes up to zoom 15 tiles, and the user selects most of Northern Alaska, do we:

select data tiles from zoom 7?
select data tiles from zoom 15?
return geopackage, geotiff, or other file formats? (PNG is unlikely to be desired)
allow the user to select multiple data layers from those that are visible?

All of these considerations also apply when asking for a WMTS capabilities document describing the AOI.

robyngit commented 6 months ago

Related concept: Here's a mockup from @hngrtr imagining how we could show summary statistics for given areas of interest (a pre-defined tile in this case):

mbjones commented 3 months ago

Google doc summarizing experiments with partial data downloads in QGIS based on WMTS. Challenges with unsupported datatypes in QGIS and other libraries. See document from @yvonnesjy and @ianguerin here: https://docs.google.com/document/d/1pVGlacPihHXCqO9451bVh68VeIyHC5erPx2g0RD2UQY/edit

robyngit commented 3 months ago

Possible MVP:

user selects a region of interest from the map
construct list of geotiff file paths (using z/x/y indices)
download those geotiffs from the /var/data folder

Questions for this strategy:

How does the user or MetacatUI select the resolution?
How does the user indicate which layer they would like to download?
How do we know on the MetacatUI side whether we have geotiffs in the /var/data directory for the given layer?
How do we measure the data availability for the given layer and the region selected, other than attempting to download the tiles?

robyngit commented 1 month ago

WIP doc planning out this feature: https://docs.google.com/document/d/17tw4UMA5PJifJUV9HIBZ_wLm_W2-xImP0H1e8-Mym4A/edit#heading=h.kw93ze7l9lk0