OSB 111 The Door your student card opens it dont open for
others dont leave it open 20 seconds Machines at least two students
per machine trade off on keyboard Logon: spit
users/spit/yourname
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Reading from ArcDoc Spatial modeling Cell-based Modeling with
GRID Grid features and capabilities Basic concepts of grid-cell
processing Getting started with GRID Getting data into GRID
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from Tuesday : Make a spreadsheet that will estimate the peak
flow Q 5 =.157*A.9 *P a 1.35 *F -.21 for a five year storm in
Region XII, using a table of road crossings with their respective
contributing area A, percent forest cover F, and annual rainfall P
a. - What does your spreadsheet look like? - How does changing F
impact Q 5 ?
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SCHEDULE
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OUTLINE OSB 111 Spatial Data Data Types Attribute Tables
Gridding the World ArcView opening data viewing data gridding
data
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SPATIAL DATA points, arcs, polygons
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SPATIAL DATA Points
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SPATIAL DATA Points Arcs Polygons
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SPATIAL DATA Points Arcs Polygons Attribute Tables
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HYDROLOGY processes are intrinsically spatial
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POLYGON DATA how we tend to represent data y x soils(x,y)
vegetation(x,y) topography(x,y)
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NON-SPATIAL HYDROLOGY we model using a black box time rainfall,
runoff
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POLYGON HYDROLOGY Recognition of spatial variability might lead
to summing outputs from black boxes
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POLYGON BLOCKS representing spatial variability with polygons
produces a multitude of overlapping polygons
00.61.21.82.4300.61.21.82.43 Elevation Aspect Distance from
stream
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POLYGON vs. GRID replace the myriad overlapping polygons with a
grid of identical square polygons
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GRID HYDROLOGY summing point processes P ET I R SS
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GRID BASICS - Thinking in GRID GRID-ing the World continuous
discrete
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Gridding polygons, lines, points
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Gridding points, lines, polygons
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ASSIGNING VALUES
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A first view of ArcView Open Help first Project View Theme
Element Extensions - Spatial Analyst Workspace - where work is
saved Theme Table - attributes Legend Editor - right-click
legend
Discussion Problems: Grid the roads and stands using various
grid sizes. Overlay and comment. Grid the stands, roads, and
landslides to match the DEM grids. Verify they match. Overlay the
road lines on the road grid. Comment. Repeat with polygons.
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Practice problem: Grid the polygon coverage using different
methods and grid sizes