TELEMAC-MASCARET Forum :: Topic: Map File(s) FROM a GeoTIFF file TO T3 2D Scalar Mesh Object (1/1)

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TOPIC: Map File(s) FROM a GeoTIFF file TO T3 2D Scalar Mesh Object

Map File(s) FROM a GeoTIFF file TO T3 2D Scalar Mesh Object 1 year 8 months ago #40806

a.barton OFFLINE Moderator Posts: 529 Thank you received: 139	This new functionality will be available after BK 3.12.4-alpha. Continued from #40797 The idea is to be able to map a GeoTIFF image directly onto a T3 2D Scalar Mesh. However, Map Object requires that you load your image into the WorkSpace first; whereas Map File(s) does not have this requirement. The options used: A pretty result: Kindly, Alan
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Map File(s) FROM a GeoTIFF file TO T3 2D Scalar Mesh Object 1 year 8 months ago #40808

a.barton OFFLINE Moderator Posts: 529 Thank you received: 139	To be more clear... in the example above, there is exactly ONE GeoTIFF file that is assigned to the current attribute in the T3 2D Scalar mesh. Kindly, Alan
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Map File(s) FROM a GeoTIFF file TO T3 2D Scalar Mesh Object 1 year 8 months ago #40831

a.barton OFFLINE Moderator Posts: 529 Thank you received: 139	And... now there are 2; the new Map File(s)... option now allows you to map the maximum value across all GeoTIFF files directly onto a 2D T3 Scalar Mesh. Marching on... Kindly, Alan
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Map File(s) FROM a GeoTIFF file TO T3 2D Scalar Mesh Object 1 year 8 months ago #40832

a.barton OFFLINE Moderator Posts: 529 Thank you received: 139	And... now there are 3; the new Map File(s)... option allows you to map the minimum value across all GeoTIFF files directly onto a 2D T3 Scalar Mesh. Marching on... Kindly, Alan
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Map File(s) FROM a GeoTIFF file TO T3 2D Scalar Mesh Object 1 year 8 months ago #40833

a.barton OFFLINE Moderator Posts: 529 Thank you received: 139	As a side note... the min/max mappings will also automatically convert the GeoTIFF co-ordinate system to the mesh's co-ordinate system. So... if they are different co-ordinate systems then the mapping will still succeed in the case that both co-ordinate systems are supported by Blue Kenue. Kindly, Alan
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Map File(s) FROM a GeoTIFF file TO T3 2D Scalar Mesh Object 1 year 8 months ago #40834

a.barton
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Posts: 529
Thank you received: 139

And... now there are 4

Load your 2D T3 Scalar Mesh
OPTIONAL: Edit > Add Attribute... to add a new attribute onto your mesh that can store the SUM
Tools > Map File(s)... to select the GeoTIFF files that you want to sum

2022-08-22_BK_Map_Sum_GeoTIFF_value_across_all_files_onto_Mesh.png

In the above example, I added 2 attributes and did Map File(s)... twice. The first time with 1 GeoTIFF file and attribute Sum_1 selected and the second time with 2 GeoTIFF files and attribute Sum_2 selected. The 2 GeoTIFF files were exact copies of each other. That way, when I look at the results, the stats for attribute Sum_1 and attribute Sum_2 should be exactly half/double the other.

Also, the tables that have been added to the Blue Kenue WorkSpace show you exactly which files were selected for summing.

Kindly,
Alan

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Map File(s) FROM a GeoTIFF file TO T3 2D Scalar Mesh Object 1 year 8 months ago #40836

a.barton OFFLINE Moderator Posts: 529 Thank you received: 139	Note that the "Assign" option may be helpful in the case that you have a set of GeoTIFF tiles for an area. Then you only need to create your mesh and map/assign ALL GeoTIFFs and the tiles under your mesh will be mapped by assigning to the mesh for you. No need to perform GeoTIFF tile stitching at all! Kindly, Alan
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Map File(s) FROM a GeoTIFF file TO T3 2D Scalar Mesh Object 1 year 8 months ago #40837

a.barton OFFLINE Moderator Posts: 529 Thank you received: 139	And since today seems to be a productive day, here's the 5th one for AVERAGE (a.k.a. MEAN) Enjoy! Kindly, Alan
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Map File(s) FROM a GeoTIFF file TO T3 2D Scalar Mesh Object 1 year 8 months ago #40926

a.barton
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Posts: 529
Thank you received: 139

The next Blue Kenue after 3.12.5-alpha will have this new feature... i.e. be able to perform an interpolated mapping from GeoTIFF files to a 2D T3 mesh

Steps:
- Load 2D T3 mesh for area of interest
  - Add attribute "Not interpolated" to the mesh
    - Ensure the current attribute is "Not interpolated"
    - Tools > Map File(s)...
    - Select "Assign all GeoTIFF files (*.tif) to the selected 2D T3 Mesh object (No interpolation)"
    - Select the GeoTIFF files to use
  - Add attribute “Interpolated" to the mesh
    - Ensure the current attribute is "Interpolated"
    - Tools > Map File(s)...
    - Select "Assign all GeoTIFF files (*.tif) to the selected 2D T3 Mesh object (Interpolated)"
    - Select the GeoTIFF files to use

So... you may now choose which way you'd like to do it.

Hope that helps people...

Kindly,
Alan

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Map File(s) FROM a GeoTIFF file TO T3 2D Scalar Mesh Object 1 year 8 months ago #40944

a.barton OFFLINE Moderator Posts: 529 Thank you received: 139	BK 3.12.6-alpha now available to try out these new things at your convenience... Kindly, Alan
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