Arc: Getting Data

1
Arc Getting Data

• Dr Andy Evans

2
Getting Data/Features from Layers

• Assign your Layer to an appropriate Interface.
• IGeoFeatureLayer Treat as geographical data
• IFeatureLayer Treat as a general Layer
• IAttributeTable Treat as an attribute table
• Get the Attribute Table or search the Layer.

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Getting data

• Once we have our Layer, we want to get data from
  it.

Map
AttributeTable
FID Data
1 234
2 875
Layer
Feature
234
Values
4
Getting the Attribute Table

• Assuming we have a Layer Enumeration, we set the
  Layer to an IAttributeTable.
• import com.esri.arcgis.geodatabase.
• IAttributeTable pAttributeTable
• (IAttributeTable) enumLayer.next()
• ITable table pAttributeTable.getAttributeTable()
  
• IRow row null
• for (int i 1 i lt table.rowCount(null) i)
• row table.getRow(i)
• int index table.findField("School")
• Object value row.getValue(index)

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Getting the Attribute Table
IAttributeTable pAttributeTable
(IAttributeTable) enumLayer.next()
ITable table pAttributeTable.getAttributeTable
() IRow row null for (int i
1 i lt table.rowCount(null) i) row
table.getRow(i) int index
table.findField("School") Object value
row.getValue(index)
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Getting data

• Alternative is to get data from a Feature.

Map
AttributeTable
FID Data
1 234
2 875
Layer
Feature
234
Values
First though, we need to get only the features we
are interested in. We can search for these.