Download Lecture 06

Basic Spatial Queries
From Digitizing to Editing

Editing feature shapes

The editing process

Maintaining spatial relationships

Editing feature attributes

Creating events from tabular data
Editing Feature Shapes

It all starts with a sketch
The Editing Process
1. Add your reference data
2. Start EDIT session
3. Set editing environment

Target layer

Snapping distance
4. Identify the feature’s sketch
5. Edit your vertices
6. Be sure to save your edits
Maintaining Topology

Maintaining spatial relationships
Editing With Topology
Editing Feature Attributes


Attributes Feature
Dialog
Attribute Table
Calculating Attributes

Field Calculator
Digitizing Features
Points From Tables
Basic Spatial Queries
Query By Location
Parcel# 231 -12-687
Owner John Doe
Zoning A3
Area
2,400
Value
179,820
Elevation = 347 m
Query By Attribute
PROPERTY
NUMBER
1
2
3
4
5
6
AREA
m2
OWNER
TAX
CODE
SOIL
QUALITY
100,000
50,000
90,000
40,800
30,200
120,200
TULATU
BRAUDO
BRAUDO
ANUNKU
ANUNKU
SILIMA
B
A
B
A
HIGH
MEDIUM
MEDIUM
LOW
LOW
HIGH
A
B
CONDITIONAL QUERY
Example: the best property has:
Area: > 40,000 m 2
Owner: not Silima
Tax code: B
Soil Quality: High
Answer: Property number 1
2
4
5
3
6
Not So Basic Spatial Query
TIMBER STANDS
TIMBER STANDS
AREA
(HA)
30
STAND
NAME
A-3
NORTH
C-1
EAST -1
10
C-2
EAST -2
40
SPECIES
AREA
(HA)
15
STAND
NAME
A-3
NORTH
PINE
C-1
EAST -1
10
PINE
MIX
C-2
EAST -2
20
MIX
PINE
SPECIES
PINE
HL
HI
HL
LI
LL
HI
LL
LI
HL
HI
HL
LI
LL
HI
LL
LI
HI
HI
HL: HIGH LITERACY
LL: LOW LITERACY
HI: HIGH INCOME
LI: LOW INCOME
HL
HI
LL
LI
LL
HI
HL
LI
HL
HI
LL
LI
NOT HI
LL
HI
HL
LI
HI
HI
HL
HI
LL
LI
LL
HI
HL
HI
LL
LI
LL
HI
HL
LI
HL
HI
LL
LI
LL
HI
HL
LI
HI
HI
HL
HI
LL
LI
LL
HI
HL NOT HI
Bool
HL
LL
LI
HI
HL
HL
HI
LI
LL
HI
LI
HI
HL OR HI
HL
LI
HL
HI
LL
LI
HL AND HI
LL
HI
HL
LI
HI
HI
Point-in-Polygon
Point features
Selected Points
Regions
Selected regions
A
B
Commercial
Residential
Flood
zone
Surface class
Frequency (ha)
Commercial, non-flood
77
Commercial, flood
25
Residential, non-flood
27
Residential, flood
120
C
Commercial - non-flood
Commercial - flood
Residential - flood
Residential - non-flood
ATTRIBUTE
CODE
SOIL
TYPE
ATTRIBUTE
RECODE
NEW
SOIL
Recode / Reclassify
1
1
A1Z
1
A
2
A2Z
1
A
3
A3Z
1
A
4
A3Y
1
A
5
B1Y
2
B
6
B2Y
2
B
7
C6H
3
C
8
C6J
3
C
9
C7J
3
C
2
5
3
6
1
3
4
2
5
1
7
7
8
9
3
8
ORIGINAL SOIL COVERAGE
RECODED SOILS
Recode / Reclassify
SOILS
AGRICULTURAL SOILS
RECODE :
A - B = AGRICULTURAL
C - E = NON - AGRICULTURAL
LAND COVER
FOREST
OPEN
VEGETATION
BRUSH
A
B
+
C
=
OUTPUT COVER C
SOILS
1
2
BRUSH
A
INPUT
DATA
FILE 1
+
INPUT
DATA
FILE 2
TREES
B
SOILS
CLAY LOAM
POLYGON NAME SIZE (Ha)
1
CLAY
2
2
LOAM
2
POLYGON NAME SIZE (Ha)
VEG
INPUT COVER B INPUT COVER A
Overlay
1
BRUSH
2
2
TREES
2
VEG
POLYGON
1A
1B
2A
2B
OUTPUT
DATA
FILE
SOIL
VEG
SIZE (Ha)
1A
CLAY
BRUSH
1
1B
CLAY
TREES
1
2A
LOAM BRUSH
1
2B
LOAM
1
TREES
Overlay
CROPS
1
SOILS
2
3
2
1
WHICH SOILS OCCUR WITH CROP 3 ?
1
2
3
2
COINCIDENCE VIEW
1
ALL CROPS AND SOILS
Overlay
1
A
X
B
Y
2
SOIL TYPE
CROP TYPE
A1X
B1X
B1Y
A2X
B2Y
A2Y
YIELD POTENTIAL
FARM
PRACTICE
Point/Line-Polygon
IDENTIFICATION OF FEATURES WITHIN POLYGONS
HISTORICAL SITES
PARK DISTRICTS
POINTS
OVERLAY
+
A
B
1
=
4
PARK DISTRICTS
LINES
OVERLAY
+
RIVER Y
POINT A = DISTRICT 1
POINT B = DISTRICT 4
3
RIVERS
2
1
2
=
3
4
RIVER X = DISTRICT 1,3
RIVER Y = DISTRICT 3,4
POINT B = DISTRICT 4
BOOLEAN LOGIC OPERATIONS
+
INTERSECT
A AND B
NOT INTERSECT
A XOR B
COINCIDENCE A & B
A OR B BUT NOT BOTH
UNION
A OR B
ALL BUT
A AND B
ANY PART A & B
EVERYTHING NOT A OR B
UNION
LEVELS
A NOT B
SEPARATE IDENTITIES
FOR EACH SEGMENT
ANY A THAT DOES NOT
INCLUDE B
Buffer
Buffering Lines
Buffering Areas
The Simple Secret of GIS
RAILROAD
CREATE 10 KM BUFFER
RECODE
OVERLAY
A
B
+
C
D
E
RAILROAD BUFFER
A
D
B
F
C
F
F
LANDUSE
10 KM LANDUSE ZONE
Buffer Application
SPATIAL QUERY:
SHOW ALL
CITIES WITHIN
100 KM OF X
CITIES
100
DISTANCE SELECTION
NAME
POP
CLASS
DUBOP
12.5
A
TRIMAN
9.0
A
TIBOO
10.1
B
POST
11.4
C
MANT
7.1
A
RATAP
5.0
C
FEENAN
7.0
C
11.7
B
JOST
RIVERS
FLOOD ZONES
Buffer Application
VILLAGES
FLOOD -PRONE VILLAGES
ROADS
FLOOD -PRONE ROADS
Select-By-Location
Select-By-Location
Voronoi / Thiessen