Spatial Data FE 423 - Lecture 1b
Spatial Data FE 423 - Lecture 1b OSB 111 The Door your student card opens it don’t open for others don’t leave it open 20 seconds Machines at least two.
Dec 19, 2015
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- Slide 1
- Slide 2
- Spatial Data FE 423 - Lecture 1b
- Slide 3
- 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
- Slide 4
- 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
- Slide 5
- 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 ?
- Slide 6
- SCHEDULE
- Slide 7
- OUTLINE OSB 111 Spatial Data Data Types Attribute Tables Gridding the World ArcView opening data viewing data gridding data
- Slide 8
- SPATIAL DATA points, arcs, polygons
- Slide 9
- SPATIAL DATA Points
- Slide 10
- SPATIAL DATA Points Arcs Polygons
- Slide 11
- SPATIAL DATA Points Arcs Polygons Attribute Tables
- Slide 12
- HYDROLOGY processes are intrinsically spatial
- Slide 13
- POLYGON DATA how we tend to represent data y x soils(x,y) vegetation(x,y) topography(x,y)
- Slide 14
- NON-SPATIAL HYDROLOGY we model using a black box time rainfall, runoff
- Slide 15
- POLYGON HYDROLOGY Recognition of spatial variability might lead to summing outputs from black boxes
- Slide 16
- 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
- Slide 17
- POLYGON vs. GRID replace the myriad overlapping polygons with a grid of identical square polygons
- Slide 18
- GRID HYDROLOGY summing point processes P ET I R SS
- Slide 19
- GRID BASICS - Thinking in GRID GRID-ing the World continuous discrete
- Slide 20
- Gridding polygons, lines, points
- Slide 21
- Gridding points, lines, polygons
- Slide 22
- ASSIGNING VALUES
- Slide 23
- 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
- Slide 24
- Converting to GRID Grid size specification matching Grid extent display existing grid Attributes specifying attaching
- Slide 25
- 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.
- Slide 26
- Practice problem: Grid the polygon coverage using different methods and grid sizes
- Slide 27
- majority
- Slide 28
- centroid
- Slide 29
- weighted
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