GIS Library Contents - MetadataFEMA Flood Hazard Zone Preliminary Difference Areas |
This metadata information is subject to our disclaimer. Metadata information presented here is maintained manually. Therefore, date-sensitive fields such as date of last update may not be up-to-date. All metadata is subject to errors inherent in a manual process.
Descriptive name | FEMA Flood Hazard Zone Preliminary Difference Areas | |
File name | fp_dfdif | |
Spatial domain | Pima County | |
Abstract | This layer enables display of areas where the current regulatory D-FIRM data (fp_dfirm) and the preliminary 2010 D-FIRM data (pf_dfirm) are different. Attributes identify the zone attributes in each of the two FIRM datasets. fp_dfdif is intended to assist the review process by displaying areas where the flood zones or zone designations have changed. | |
Known errors/qualifications | User must filter (OLDZONE <> NEWZONE) to show just the differences. There are many small sliver areas that are not meaningful. Filtering out small areas with high perimeter to area ratios may be useful. The SLIVER field is a calculated ratio of the area and perimeter of each polygon. Filtering for SLIVER > 0.5 is a method to remove sliver polygons. It may also be helpful to filter out very small areas that don't have "sliver" shape, such as areas less than 250 square feet. | |
Feature type | polygon | |
Feature count | 2,657 | |
Thumbnail Map | fp_dfdif.pdf (2,072,907 bytes, PDF created 07/19/2022 ) | |
Projection | NAD83 HPGN (Parameters) | |
Rectification | FIRM panels | |
Field/value metadata | Field metadata | |
Source organization | PCRFCD | |
Source contact | Kenneth Maits | |
Source document or file name | fp_dfirm and pf_dfirm | |
Source date | 20090617 | |
Source scale | ||
Source format | Shape | |
Date of last data update (This date may not be current.) | 20090617 | |
Last data update by | Kenneth Maits | |
Date/time last touched - Meaning? | 2021-04-25 11:50 PM - Enterprise GDB | |
2021-04-25 11:50 PM - Shapefile - Library input format | ||
See coverage files, if any, for date. | ||
Lineage | ||
On maintenance? | No | |
Maintenance organization | PCRFCD | |
Maintenance description | ||
Original conversion by | Kenneth Maits | |
Pima County ITD GIS contact | Kenneth Maits | |
Alternate Pima County ITD GIS contact | ||
On Pima County Geospatial Data Portal? | No |