msimbazi-tutorial-lidar.tif
===========================

This file is a clip of open data. It is licensed, and the licence has conditions
that follow the file. Read this before you republish it or anything derived from
it.

Attribution (required)
----------------------

  Aerial survey data, Resilience Academy (Tanzania Urban Resilience Program /
  Ramani Huria); survey by CDR International & Shore Monitoring for the World
  Bank, Feb 2019

Licence
-------

Open Database License (ODbL) version 1.0.
Full text: https://opendatacommons.org/licenses/odbl/1-0/

Share-alike
-----------

ODbL is a share-alike licence. This clip is a Derivative Database of the
original survey, so if you publish this file, or any database you build from it
(a clipped, resampled, datum-shifted or merged terrain, a mesh, a scenario
package that embeds the elevations), you must publish that under ODbL 1.0 as
well and keep the attribution above with it.

Share-alike is triggered by republishing the DATA. It is not triggered by
publishing a rendering of it: a map image, a screenshot, a flood-depth figure or
a video frame is a Produced Work, which needs the attribution notice but may
carry your own licence.

Provenance of this clip
-----------------------

  Source dataset   msimbazi_dem_lidar_1_0m_2019 (drone LiDAR DEM, 1 m)
  Upstream portal  Resilience Academy Climate Risk Database
                   https://crd.resilienceacademy.ac.tz  (dataset 881)
  Source file      Msimbazi_DEM_LiDAR_1 0m_2019_OUTPUT.tif
  Source sha256    9d75b44fbd32b2f6800406f504f0ea0ac5cf18113e95714711dc3742807d4625
  Clip command     gdal_translate -projwin 528594 9248764 531094 9246264 \
                     -co COMPRESS=DEFLATE -co PREDICTOR=3 -co TILED=YES
  This file        2500 x 2500 px, 1 m, EPSG:32737 (WGS 84 / UTM zone 37S),
                   Float32, NoData -9999

Height datum (read this before you compare it to anything)
----------------------------------------------------------

Heights in this file are WGS 84 ELLIPSOID heights, not heights above sea level.
Ground near the river sits around -20 m because the EGM2008 geoid undulation
here is about -27.6 m. The values are internally consistent, so a simulation on
this file alone is fine, and it is a deliberately realistic starting point: it is
exactly the case the platform warns you about when you combine it with an
orthometric terrain such as Copernicus GLO-30.

Two other properties of the source survive in this clip: open water was left as
NoData rather than interpolated, and bridge and culvert openings are not cut into
the surface.