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Building footprint geometry and height attributes were extracted from 2010 ARRA LiDAR point data using ArcGIS 10 and Qcoherent's LP360 Extractor module. Feature attributes are described in the table below. All units are feet. Further documentation of data and workflow are available on request to AMBAG.<\/span><\/p>

notes<\/span><\/span><\/p><\/td>

50 char. text field used for feature comments<\/span><\/span><\/p><\/td><\/tr>

ht_min<\/span><\/span><\/p><\/td>

Minimum height derived as [Minimum LiDAR point elevation - DEM ground elevation]<\/span><\/span><\/p><\/td><\/tr>

ht_max<\/span><\/span><\/p><\/td>

Maximum height derived <\/span><\/span>as [Maximum LiDAR point elevation - DEM ground elevation]<\/span><\/span><\/p><\/td><\/tr>

ht_source<\/span><\/span><\/p><\/td>

10 char. text field used to indicate which elevation source was <\/span><\/span>used to record building height<\/span><\/span><\/p><\/td><\/tr>

DEM<\/span><\/span><\/p><\/td>

DEM ground elevation for a representative point within each building feature<\/span><\/span><\/p><\/td><\/tr>

ndsm<\/span><\/span><\/p><\/td>

Alternate building height derived from the nDSM layer, like above, sampling from a representative point within each building feature<\/span><\/span><\/p><\/td><\/tr>

Extent<\/span><\/span><\/p><\/td>

25 char. text field describing the <\/span><\/span>community/region or collection of tiles that the feature was processed within<\/span><\/span><\/p><\/td><\/tr>

pntCnt<\/span><\/span><\/p><\/td>

number of LiDAR points classified as 'Building' wit<\/span><\/span>hin the feature polygon<\/span><\/span><\/p><\/td><\/tr>

ELAV<\/span><\/span><\/p><\/td>

Average elevation of LiDAR points classified as 'Building' wit<\/span><\/span>hin the feature polygon<\/span><\/span><\/p><\/td><\/tr>

ELMN<\/span><\/span><\/p><\/td>

Minimum elevation of LiDAR points classified as 'Building' wit<\/span><\/span>hin the feature polygon<\/span><\/span><\/p><\/td><\/tr>

ELMX<\/span><\/span><\/p><\/td>

Maximum elevation of LiDAR points classified as 'Building' wit<\/span><\/span>hin the feature polygon<\/span><\/span><\/p><\/td><\/tr>

ELSD<\/span><\/span><\/p><\/td>

Standard Deviation of elevation of LiDAR points classified as 'Building' wit<\/span><\/span>hin the feature polygon<\/span><\/span><\/p><\/td><\/tr>

ht_ave<\/span><\/span><\/p><\/td>

Used as the primary building height field. In most cases, this is value is calculated as: <\/span><\/span>[ELAV \u2013 DEM]. In other cases, this value is entered from the nDSM field. Those cases are noted as 'nDSM' in the ht_source' field.<\/span><\/span><\/p><\/td><\/tr>

Notes2<\/span><\/span><\/p><\/td>

50 char. text field used for additional feature comments, specifically identifying footprints that had overlap with adjacent features.<\/span><\/span><\/p><\/td><\/tr>

Shape_Leng<\/span><\/span><\/p><\/td>

ArcGIS length field<\/span><\/span><\/p><\/td><\/tr>

Shape_Area<\/span><\/span><\/p><\/td>

Feature area calculated in square ft.<\/span><\/span><\/p><\/td><\/tr><\/tbody><\/table>

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