DSM TOOLS AND METHODS

Day1: Lecture 3

Database development

• The core of DSM

• Features– It should be user friendly

– It should contain adequate information

– Amenable to DSM software

• Software– MS Office

– QGIS

– ILWIS

Obtaining DSM data

• Clarify what is to be done (Map properties/classes)

• Specify type of data needed

• Identify sources and summarize data availability

• Document available data and check for gaps

• Obtain the data

Data Type Source

Soil Soil profiles ISRIC (http://www.isric.org/data/isric-wise-global-soil-profile-data-ver-31)

Soil maps UN-FAO (http://www.fao.org/soils-portal/soil-survey/soil-maps-and-

databases/soil-profile-databases/en/)

IIASA

(http://www.iiasa.ac.at/web/home/research/modelsData/HWSD/HWSD.en.html)

Soil legacy reports FAO (http://www.fao.org/soils-portal/soil-survey/soil-maps-and-databases/soil-

legacy-reports/en/)

Laboratory analytical

data

National soil laboratories, research institutes (e.g. NGOs, Universities, etc)

Remote

sensing image

MODIS NDVI (250 m) USDA (http://pekko.geog.umd.edu/usda/apps/)

Land cover (300 m) ESA (http://due.esrin.esa.int/globcover/)

Landsat (30 m) GLCF (http://glcf.umd.edu/data/)

Cover (< 30 m) National aerial photo missions

DEM SRTM (90 m) http://srtm.usgs.gov/

ASTER (30 m) http://asterweb.jpl.nasa.gov/gdem.asp

DEM (<30 m) National contour maps

Geology 1:1 M National geologic maps

> 1:1 M Sub-regional (sub-national) geologic maps

Climate Rainfall National meteorological departments

Create DSM workspace

C:\\DSM - where we will work C:\\DSM\Input - where to keep input data C:\\DSM\Output - where to keep output data

Example data acquisition

• Interest: to map clay content

• Identified study area – in Makueni (Kenya)

• Data sources

– ISRIC – soil profiles

– EUSOILS – Soil map

– Government soil department – soil profiles

– Academic institution – soil profile

• Document the data availability and gaps

Soil data

Download online data

• Soil map at http://eusoils.jrc.ec.europa.eu/esdb_archive/eudasm/africa/index.html

• Soil profile at

http://www.isric.org/data/isric-wise-global-soil-profile-data-ver-31

• Other soil data

– Gvt

– Academic institution

Obtaining data from EUSOIL

Example

Example of downloaded map

Obtaining data from ISRIC

Example

Other examples: online data acquisition

• Land cover

http://due.esrin.esa.int/globcover/

• DEM

http://srtm.usgs.gov/

• Other (Gvt departments)

– Rainfall

– Geology

– Landform

Environmental covariate data

Example: 300 m Land cover (2009)

Example: 30 m DEM

Example: Downloading MODIS

Which soil data is available

Which environmental covariate is available

Detailed soil map with Legends and soil data

Soil point data with sitedescription

Detailed soil map with legend

No data

All covariatesC, O, R, P

At least 3 covariatesIncluding R & O

At least 2 covariatesIncluding R

Only one covariate No data

Increasing level of data inadequacy

Climate (C)Organism (O)Relief (R)Parent (P)

Relief (R)Organism (O)

Relief (R)

Climate – mean rainfall (map or weather station data)Organism – Land use/land coverRelief – Elevation map (DEM)Parent – Geology mapSoil – georeferenced soil properties, profile, map

Data Type Number Source

Assignment: Building geo-database for DSM application-STEP 1

• Use your own data

• Explore the data

• Document the characteristics of the data:– Source and author of data

– Data type (profile, analytical, georeferenced, maps, etc.)

– Number of samples/cases

– Use the table format (use Data, Type, Number, Source, as column heading)

• Save the database & documentation (C:\\DSM\Input)

• Remember to hand in your work by Next Morning before start of the session