RGDSS_Task1_Irrigated Lands Assesment

• Title: RGDSS Task 1 Irrigated Lands Assessment
• Description: This report describes the approach and results for Task 1 - Irrigated Lands Assessment portion of RGDSS.
• Decision Support - Doc Type: Task Memorandum
• Date: 7/24/2000
• DSS Category: Consumptive Use
• DSS: Rio Grande
• Basin: Rio Grande
• Contract/PO #: C153863
• Grant Type: Non-Reimbursable
• Bill Number: HB98-1189, SB99-173
• Prepared By: Agro Engineering

TABLE OF CONTENTS
1.0 EXECUTIVE SUMMARY .................................................................................................. ... 1
2.0 INTRODUCTION ................................................................................................................ ... 4
3.0 APPROACH ......................................................................................................................... ... 7
3.1 Ditch Service Area Coverage ................................................................................... ... 7
3.1.1 Data Acquisition ........................................................................................ ... 7
3.1.2 Boundary Delineation ................................................................................ ... 7
3.1.3 Database Attributes .................................................................................... . 10
3.1.4 Accuracy Refinements ............................................................................... . 10
3.2 Satellite Imagery ....................................................................................................... . 12
3.2.1 Data Acquisition ........................................................................................ . 12
3.2.2 Data Preprocessing .................................................................................... . 20
3.2.3 False Color Infrared Image Processing ...................................................... . 21
3.2.4 Image Classification .................................................................................. . 21
3.3 Irrigated Parcel Delineation ...................................................................................... . 25
3.3.1 Boundary Delineation ................................................................................ . 25
3.3.2 Crop Type Delineation and other Database Attributes .............................. . 26
3.3.3 Irrigated Parcel Refinements ..................................................................... . 29
3.3.4 Accuracy Assessment of Crop Type Designation and Irrigated Acreage . . 29
3.4 Land Cover Classification ........................................................................................ . 32
3.4.1 Classification Methodology ....................................................................... . 32
3.4.2 Boundary Delineation ................................................................................ . 32
3.4.3 Database Attributes .................................................................................... . 32
4.0 RESULTS ............................................................................................................................. . 35
4.1 Assignment of Irrigated Acreage to Ditch Service Area .......................................... . 35
4.2 Crop Type Statistics for Irrigated Lands ................................................................... . 36
4.3 Surface Water Use Statistics ..................................................................................... . 36
4.4 Ground Water Use Statistics ..................................................................................... . 37
4.5 Surface Water Only Statistics ................................................................................... . 37
4.6 Ground Water Only Statistics ................................................................................... . 38
4.7 Conjunctive Use Statistics ........................................................................................ . 38
4.8 Irrigated Lands with Unknown Supply Statistics ..................................................... . 38
4.9 Irrigation System Type Statistics .............................................................................. . 38
4.10 Land Cover Classification Statistics ....................................................................... . 39
5.0 SUMMARY AND CONCLUSIONS ................................................................................... . 44
GLOSSARY ................................................................................................................................ . 46
APPENDIX A. INTERVIEWS TO DETERMINE DITCH SERVICE BOUNDARIES........... . 50
APPENDIX B. INTERVIEWS TO VERIFY AND REFINE IRRIGATED ACREAGE.......... . 53
APPENDIX C. 1998 IRRIGATED ACREAGE BY DITCH ..................................................... . 56
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