Geographic Data Primitives
Large number:
Points, multiipoints, lines,
polylines, splines, rasters, images,
surfaces, networks….
But, 95% of the time we deal with
these five:
RESIN GIS Workshop #1, November 6, 2009, John Radke, Howard Foster
GIS data primitives, cont.
The standard five:
Points
Lines (aka “arcs”)
Geo-primitives, cont.
Polygons
Rasters
Images (many image formats)
Geo-primitives, the big idea
That almost all of these primitives
can be linked to attribute
information via an unique
identfier imbedded within each
object.
2102
Attributes of geo-primitves
OID
2102
2101
2102
2103
2104
base
Te
Tf
Tf
Aa
% organics
2
0.01
0.02
0.09
parent material
granite
granite
basalt
alluvium
ave. depth
2.2
1.2
0.1
4.4
Levee segment data (many names)
example
flood_zone wse2000
wse2050
wse2100
41
9.04896069 10.80602074
14.80202579
41
9.04896069 10.80602074
14.80202579
41
9.04896069 10.80602074
14.80202579
41
9.04896069 10.80602074
14.80202579
41
9.06147766 10.81888390
14.81573772
41
9.06147766 10.81888390
14.81573772
41
9.27748203 11.07141399
15.12763691
region
Delta
Delta
Delta
Delta
Delta
Delta
Delta
outside_mhfloodplain
0 9.21831681
0 9.21875629
0 9.21922002
0 9.21962817
0 9.21999607
0 9.22032016
0 9.18133644
name
station_id
Bethel_Island
10-600
Bethel_Island
10-500
Bethel_Island
10-400
Bethel_Island
10-300
Bethel_Island
10-200
Bethel_Island
10-100
Bethel_Island
10-20400
levee_sand
<= 20
<= 20
<= 20
<= 20
<= 20
<= 20
<= 20
lidar_smoo
12.55000000
12.51000000
12.47000000
12.43000000
12.40000000
12.37000000
12.66000000
station_la mean_organ
10_6+00
11.63753223
10_5+00
11.63572598
10_4+00
11.61413002
10_3+00
11.62975216
10_2+00
11.65677643
10_1+00
11.70969963
10_204+00
8.92799473
levee_type alternate_
Non-project Levee
Non-project Levee
Non-project Levee
Non-project Levee
Non-project Levee
Non-project Levee
Non-project Levee
lidar_ft
comments_l
comments_o
12.57000000
12.30000000
12.80000000
13.12000000
13.16000000
13.06000000
13.12000000
slough_wid
Narrow
Narrow
Narrow
Narrow
Narrow
Narrow
Not Narrow
foundation
11-20
11-20
11-20
11-20
11-20
11-20
6-10
st_length_
100.00002689800
100.00007193900
99.99884010930
99.99965389860
99.99947705530
100.00225452600
99.99941913610
steepness crown_z_ft
mhhw_z_nav
lat_
long_
No
11.95891600
4.52844858
38.03590238
-12
No
11.95891600
4.52806759
38.03563050
-12
No
11.95891600
4.52806759
38.03536162
-12
No
14.15891600
4.52820396
38.03510050
-12
No
14.15891600
4.52820396
38.03485223
-12
No
14.15891600
4.52820396
38.03461024
-12
No
12.65235500
4.47665882
38.04519822
-12
GIS display controls
Render: color, transparency, line style, symbol
style, color gradients,…
Render simply or by attribute characteristic
Attributes can be selected (e.g., “fact” < 3) for
further control over data display (ArcMap
only)
Draw order can be changed, layers turned off
and on.
Masking, labeling, etc.
Backdrop imagery
RESIN GIS data service design
Core
SQL
Metadata
Browser
Web Browser
RDBMS
File
Postgres/
system
PostGIS (shapefiles,
jpegs, etc)
ESRI
Spatial Data Engine
(SDE)
SQL
Web server technologies
Google Maps
Mapserver
Openlayers
Calmap
Clients
Workstation
Arcgis
Arc Explorer
GISC MapView
Web browser
Additional issues,
workarounds
GIS data clients
Biggest problem
ArcView 3.0
No annotation
facilities
ArcGIS ArcMap
desktop
Requires license,
dense interface
Too complex, difficult to
make annotations
ArcGIS Explorer
.net
Can’t display by
attribute, ugly
geographic
projection only
Pre-set attribute views can
be done with .lyr files.
ArcGIS Explorer
java
No annotations,
no ESRI raster
data, no
transparency
Convert rasters to images,
jpegs are problematic
GISC’s MapView
Buggy, requires all
data to be in the
same projection
ArcGIS Explorer .net
Only runs on Windows machines
Attempts to out-Google Earth with on-line
connection to good backdrop imagery
Supports all major ESRI GIS data types,
including real-time data (SDE), supports
real-time reprojection so you can use
data from different sources.
.net Arc Explorer cont.
The good:
Supports annotations.
Backdrop imagery is high quality and fast at the
desktop.
The bad:
Doesn’t (yet?) support display-by-attribute
(clumsy work-around exists.)
Poor quality with some raster data
Does not datum shift (also java version too).
.net Arc Explorer cont.
You must use local data (files on disk)
when in the field.
You must set the display to 2D mode.
You must understand the difference
between layers and shapefiles and the
different ways you access them.
.net Arc Explorer
Resources:
http://calmap.gisc.berkeley.edu/resin_gis
You will see software download
directories, help documents, data
interfaces, etc.
Demo:
Access files from a local directory:
C:/temp/resin/data_mix
Start up Arc Explorer, switch to 2D mode
Pre-defined layer list is
infrastructure_setup.nmf