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GIS Section
In general, Geographic Information Systems and Remote Sensing could be used as a tool for resource management and development. With its advantages of spatial, spectral and temporal availability of data covering for large and inaccessible areas within short time has become a very handy tool in assessing, monitoring and conserving Natural resources.
The unit will engage this year in accomplishing the following tasks
- Delineation of watershed/ REST project boundary based on the drainage patterns and/or other means of development approaches for further assessment and analysis works. These tasks will include extraction of image, digitizing of contours, and preparation of digital elevation model and scanning and geo-referencing of hard copy maps.
- Preparation of inventory Maps for existing resources with in the watershed/REST project areas as regards to natural resource like soil, land use/cover, infrastructures, drainage, slope, climatologically and socio-economic situation.
- Preparation of land capability and suitability/development maps for REST project areas. Based on the requirement of development interventions and resource criteria, algebraic and map calc analysis will be processed to meet the mention task.
- Comparisons of environmental changes in REST project areas. With the existing access to new technologies that offer promising opportunity for monitoring changes, application of remote sensing has extraordinary ability to collect environmental data on continuing and regular bases using timely series satellite imagers to evaluate and to observe the change in REST-induced interventions areas.
- Geo-referencing of the available image for makes them ready for use.
- Two research based Modeling works will be accomplished, one for risk erosion and the other in ground water resource evaluation and identification in hard rocks.
Daereka water shade
Because of Geo-positioning, to some extend global climate variability and poor resource utilization and management; Tigray is affected frequently by extremely erratic rainfall. In addition to these less and variable rainfall, high erosion, low level farming technology are also another serious problem, which causes, drought and poor usages and database management.
To avert such problems REST is actively participating in the development programs of rural areas. Therefore to improve the efficiency of the staff, as whole, organizational input in the development program, REST needs a new technology to ensure successfulness benefits of poor people.
Thus GIS (Geo information system), RS (Remote Sensing) and DBMS (Data base management System) are best tools to design a system and to provide appropriate information for discussion makers and experts in the area of environmental and resource management, development planning and other research works.
What is GIS?
GIS is defined as in information system that is used to input, Store, Retrieve, manipulates, analyze and out put geographically referenced data. In order to support decision making for planning and management of land use, natural resources and environment changes.
- The key components of GIS are computer system, Geo-spatial data and users
- The sources of Geo-spatial data are digitized maps, aerial photograph, satellite images, statistical tables and other documents.
- Geo-spatial data classified into Goe-metric data (maps) and thematic data(tables)
What is remote sensing?
- Is a science and art of obtaining information about an object, area, or any phenomenon through sensing of objects from distance with out having a physical contact?
- What exist at a particular location?
- Which location satisfies certain conditions?
- Trends that have changed or in the process of changing
- Analyzes spatial relation b/n objects of geographic features
- Model based questions (suitable land, risky area)
GIS Components
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IN GENERAL GIS USES
GIS/Remote sensing with its advantages of spatial, spectral and temporal availability of data covering large and inaccessible areas within short time has become a very handy tool in assessing, monitoring and conserving groundwater resources. SRTM and image Satellite data provides quick and useful baseline information on the earth.
In the global way GIS can help us in telling