This document outlines the factors to consider when selecting a suitable location for a GIS picnic. It examines elevation, slope, distance from developed areas and water features, and proximity to green land to generate suitability indexes. These indexes on development, elevation, slope, hydrology, and land use are combined into an overall suitability raster map where red areas are most suitable and blue areas are least suitable for a picnic. The best locations are marked with smiley faces on the resulting map.

1. Siting a Suitable Place For GIS Picnic
LARP 741 - Week03
Wei Ying
HighLowSuitability

2. Development Factor
Elevation & Slope Factors
1- Reclassify to identify developed land (Buildings, Public Roads, Private Drive and Parking Lots).
2- Build Euclidean Distance to development grids.
3- Reclassify for Suitability Index, the further from development land the better, for good open-land view.
1- Reclassify Elevation grids Suitability Index, the higher elevation, the lower
index, considering relaxing and less physical output.
2- Based on elevation, build create slope using “Slope” tool in Spatial Analyst.
3- Reclassify Slope for Suitability Index, the flatter the better for picnic
convenience.
Suitability Index
Elevation
0 1 2 3 4 5 6 7 8 9 10
Slope
Distance
Other
Developed
Legend
Low: 0 High: 9

3. Suitability Index
Hydrology Factor
1- Reclassify and create Euclidean Distance to water feature.
2- Reclassify for Suitability Index, the closer to water the better. But picnic cannot be hold in water, so
where the distance is zero, the index is zero.
Land Use Factors
1- Reclassify Land Use for Suitability Index
2- Reclassify for green land (lawn, crop,
pasture), and create Euclidean Distance.
3- Reclassify the distance for Suitability
Index. The closer to the green, the better
the scenery and picnic environment, the
higher index.
Distance
Distance
Other
Green Land
Legend
Other
Hydrology
Legend
Open Water
Non-Forest Wetlands
Crops
Pasture
Lawn
Under Construction
Recreational Land
Institutional Land
Low Density Residential
Median Density Residential
High Density Residential
Farmsteads
Livestock Feed Centers
Industrial/Commercial Land
Commercial Land
Legend
Low: 0 High: 9

4. DEVELOPMENT ELEVATION SLOPE
HYDROLOGY Land TYPE GREEN
Suitability
High : 107
Low : 0
Summary:
Based on the six indexes, use
Raster Calculator to generate
complex index, which indicates the
suitability for being a picnic for
GIS group members. Shown in
result map, the red lands are good
for picnic, while the blue definitely
not. The sites marked with smile
face are the best choices as this
report suggests.