Datasets > Nigeria > 2010-2014

GRID3 NGA - Travel Time Friction Surface v1.0

Humanitarian Data Exchange · 2010 Full Details

Full Details

Title
GRID3 NGA - Travel Time Friction Surface v1.0
Description
The aim of this work is to generate two friction surfaces for modeling physical accessibility: one incorporating walking speed only, and another combining walking and motorized travel speeds. Motorized speeds are applied exclusively on roads that are present and passable by vehicles; in all other areas, walking speeds are used. The GRID3 NGA - Travel Time Friction Surface v1.0 dataset is a spatial data layer in tiff format. The datasets contain 2 layers: ⦁ GRID3_NGA_walk_travel_time_friction_surface_v1_0.tif - Applies walking speeds across the entire surface, adjusted for slope and elevation. ⦁ GRID3_NGA_mix_travel_time_friction_surface_v1_0.tif - Applies motorized speeds on roads and walking speeds in all other areas. The resolution is 30 m. The unit of measurement in both surfaces is minutes per meter. Dataset citation: Center for Integrated Earth System Information (CIESIN), Columbia University. 2025. GRID3 NGA - Travel Time Friction Surface v1.0. New York: Columbia University. URL. Accessed DAY-MONTH-YEAR. Contacts and data queries: The authors of this dataset appreciate feedback regarding the data, including suggestions, discovery of errors, difficulties in using the data, and format preferences. For dataset-related questions, please send an email to: info@ciesin.columbia.edu
Creator
Center for Integrated Earth System Information (CIESIN), Columbia University
Publisher
Humanitarian Data Exchange
Temporal Coverage
2010-01-01 to 2025-08-31
Date Issued
2025-10-31
License
http://www.opendefinition.org/licenses/cc-by-sa
Access Rights
Public
Date Added
November 17, 2025
Provenance Statement
The metadata for this resource was last retrieved from Humanitarian Data Exchange on 2026-01-15.

Resource Class

Theme

Place

Location

Links

Cite and Reference

  • Citation
    Center for Integrated Earth System Information (CIESIN), Columbia University (2025). GRID3 NGA - Travel Time Friction Surface v1.0. Humanitarian Data Exchange. https://data.humdata.org/dataset/1ee2bae6-b339-4aaa-86f6-4817037e3f3a (dataset)
  • BTAA Geoportal Link

View more items like this one...

GRID3 NGA - Roads v1.0

2016

GRID3 NGA - Settlement Extents v3.1

2016

GRID3 COD - Settlement Names v7.0

2019

GRID3 COD - Health Zones v7.0

2019

GRID3 COD - Health Areas v7.0

2019

GRID3 COD - Religious Centers v1.0

2021

GRID3 COD - Schools v1.0

2021

GRID3 NGA - Health Facilities v2.0

2018

GRID3 COD - Health Facilities v7.0

2019

United Republic of Tanzania Motorised Travel Time (in seconds) to nearest health centre

2024