Field verification was performed on a small portion of fields in Division 1. This was done by RTi staff with the assistance of different water users in the area. Field verification was performed in order to calibrate RTi photointerpretation skills, verify Landsat NDVI interpretations, and check parcels with questionable irrigation.
Topology was verified and corrected using ArcGIS 9.0 Geodatabase Topology. Overlap Summary: Rule Errors Exceptions Parcels Must Not Overlap 0 0
1. Produce multidate NDVI composite images 2. Print hard copy maps of orthoimagery, transparent NDVI composite, and DRGs 3. Interpret and draw parcel boundaries on hardcopy maps. 4. QAQC parcel drawings. 5. Digitize parcel boundaries on screen using field interpretation maps as reference. 6. Based on photointerpretation, attribute parcels with irrigation type. 6. QAQC digitized parcels.
1. Created preliminary surface water irrigation service areas. Service areas were created using key irrigation diversion structures, a 24K irrigation ditch layer, and a Digital Elevation Model (DEM). The land below each diversion and ditch was identified. Service area polygons were then digitized from the land that could possibly be irrigated by gravity from each diversion. 2. Parcels within each service area were then attributed with the WDID of that service area and diversion structure.
1. Used multidate Landsat spectral signatures to classify irrigated parcels with crop type. 2. Attributed parcels with crop type from classification.
1. Maps of irrigated parcels, irrigation service areas, crop types, DOQQs, and other information were printed at an appropriate scale. 2. Meetings were held with water commissioners, ditch companies, and various ground water user groups. 3. Maps were reviewed by water users. Detailed notes and corrections were made on the maps. Including, corrections to irrigation service areas, crop types, and ground water use. 4. Preliminary irrigated parcels were edited with the information gained from water users. 5. Secondary meetings were held with Water Commissioners and major ditch companies to verify and approve the final edited parcels. 6. Additional information learned from the secondary meetings was edited in the parcel database.
1. Information gained from water users on groundwater use was attributed in the parcels. Water users provided information on parcels that were irrigated with ground water only, parcels whose irrigation was supplemented with ground water, and parcels that receive only surface water irrigation. In some cases users also supplied which well irrigated certain parcels. 2. Parcels that have no access to surface water were attributed as ground water only. 3. Center pivot parcels were given common IDs. Each part of a single center pivot parcel was given the same ID. This was done to ensure that the different parts of the center pivot would be matched to the same wells. 4. The CDSS StateDGI program was run to assign decreed wells to irrigated parcels. This was done with all parcels, except those identified by water users as being irrigated with surface water only and parcels located in closed basins where no decreed wells exist. Parcels with no surface water access and parcels identified by users as receiving ground water only were marked as ground water only. At this stage all other parcels were treated as surface water irrigation. 4. After the first iteration of StateDGI the resulting well_parcel table was edited. For those parcels whose irrigation well was identified by water users the table was edited so that the appropriate well was matched to the correct parcel. The common center pivot IDs were changed back to their original parcel IDs. Matches that were edited or modified were marked as a type 5 match. 5. After editing the well_parcel table a second iteration of StateDGI was performed. This iteration was run only with parcels whose irrigation is supplemented with ground water and did not have a well match from the first iteration of StateDGI. The parcels were marked as ground water only for StateDGI purposes. The resulting well_parcel table from this iteration was appended to the first well_parcel table and edited with any additional user information. 6. A third iteration of StateDGI was performed using closed basin well permits and only those parcels located in the closed basins where no decreed wells exist. All of these parcels are ground water only. The resulting well_parcel table was also appended to the final well_parcel table. 7. The final well_parcel table was reviewed for errors, duplicate records, and consistency with user information.
1. All parcels with a SW_WDIDx = 0200804 were changed. Those parcels with 0200804 (50%) and 0200834 (50%) were changed to SW_WDID1 = 0203876 (100%). Parcels with SW_WDID1 = 0200804 were changed to SW_WDID1 = 0203876 (100%)
2. All parcels with a SW_WDIDx = 0200818 were changed. Parcels with SW_WDID1 = 0200818 (50%) and SW_WDID2 = 0200817 (50%) were changed to SW_WDID1 = 0200817 (100%). Parcles with SW_WDID1 = 0100818 (50%) and SW_WDID2 = 0203837 (50%) were changed to SW_WDID1 = 0203837 (100%).