2025 Data (Information)
GRID3 NGA - Travel Time Friction Surface v1.0
The dataset is a spatial data layer in tiff format, containing 2 layers:
Walking friction surface: Applies walking speeds across the entire surface, adjusted for slope and elevation.
Mixed-mode friction surface : Applies motorized speeds on roads and walking speeds in all other areas.
Keywords: Roads
Files
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GRID3 NGA - Travel Time Friction Surface v1.0 - Data Release Notes .pdf
application/pdf
104 KB
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GRID3_NGA_mix_travel_time_friction_surface_v1_0.zip
application/zip
-1020 MB
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GRID3_NGA_walk_travel_time_friction_surface_v1_0.zip
application/zip
-885 MB
Download File
More About This Work
- Academic Units
- Center for Integrated Earth System Information
- Series
- GRID3
- Published Here
- October 21, 2025
Notes
Dataset citation:
Center for Integrated Earth System Information (CIESIN) , Columbia University 2025. GRID3 NGA - Travel Time Friction Surface v1.0. https://doi.org/10.7916/tw5k-ys98. Accessed
Terms of use:
Users are free to download, store, access, use, copy, adapt, transform, alter, arrange, build upon, distribute and transmit this work and any derivative works. Attribution of the source must be provided, and further distribution of this work or derived work must maintain the same terms of data use and license as set forth in this Terms of Use.
Copyright 2024. The Trustees of Columbia University in the City of New York.
Data license:
The data and accompanying document are licensed under a Creative Commons Attribution-ShareAlike 4.0 International, CC BY-SA 4.0 (https://creativecommons.org/licenses/by-sa/4.0) and specified in legal code (https://creativecommons.org/licenses/by-sa/4.0/legalcode).
Contacts and Data Queries:
We appreciate feedback regarding this dataset, including suggestions, discovery of errors, difficulties in using the data, and format preferences. Please contact: CIESIN, info@ciesin.columbia.edu
