environmental systems modeling eenv 5326 gis for environmental engineering
TRANSCRIPT
Environmental Systems Modeling
EENV 5326
GIS for Environmental Engineering
The application of GIS is limited only by the imagination of those who use it
Jack Dangermond, President of ESRI
Chloride Concentration (mg/l) in 2001 and 2011
About 12 rainfall stations
Rainfall precipitation increases from south
to north
Rainfall Pattern in Gaza Strip
About 12 rainfall stations
Rainfall precipitation increases from south
to north
GIS views
In GIS, there are 3 different ways in which data can be viewed:
1) Database view2) Map view3) Model view
The popular GIS software
ESRI (GIS software leading company worldwide)
commercial products include ArcGIS desktop that includes:
ArcMap, ArcCatalog, ArcToolbox, ArcGlobe, ArcIMS and ArcGIS Explorer
/ لغة/ صفةرمز
بارعة معالجة
االستعالم
االمية محو
االطفال وفيات
عازلة
وباء
االختالف
Raster to Vector Conversion
CellRows & Columns
Regions
Zones
The composition of Raster Data
The Cell
A square that represents specific portion of an area. its dimension is described by even pixels or dimensions. Its dimensions shall be fixed all over the data set. Every cell has a value.
Rows and Columns
Regions
Connected Cells in Zones
Zones
Connected or Disconnected Cells that have the same value
• Geographic Phenomena• Geographic Field • Geographic Object
• Geographic Data Representation• Tessellation • Vector
Spatial data typesContent
We might define a geographic phenomenon as something of interest that :
• can be named or described,• can be georeferenced and• can be assigned a time (interval) at which it is/was present
Relevant phenomena depends entirely on the purpose of GIS.
Geographic Phenomena
Field Vs. Object
Object
Field
Field Vs. Object
Geographic objects: populate the study area, and are usually well
distinguishable, discrete, bounded entities. The space between them is potentially empty.
Geographic field: is a geographic phenomenon for which, for every
point in the study area, a value can be determined.
Field View Vs. Object View
Examples:
Object View: Trees, Houses, Streets.
Field View: Elevation, Temperature, Rain Intensity.
o General rule-of-thumb is that:
1) natural geographic phenomena are more often fields, and
2) man-made phenomena are more often objects.
Raster in ArcGIS – Floating point
Raster in ArcGIS – Integer
Assignments
1) Prepare professional map,2) Recharge map of Gaza strip,3) Best site of landfill