View In:
ArcGIS JavaScript
ArcGIS Online Map Viewer
ArcGIS Earth
ArcMap
ArcGIS Pro
View Footprint In:
ArcGIS Online Map Viewer
Service Description: As part of delineating the ordinary high-water mark (OHWM), Wenck georeferenced aerial imagery collected before the installation of the Lake Sakakawea dam. The North Dakota Department of Mineral Resources (DMR) provided single frame aerial imagery for the years 1951 and 1943. Photos were georeferenced using imagery from 2016 to match road crossings and rock outcrops. The 2016 photos were downloaded from Geospatial Data Gateway as SID files as opposed to using the streaming web service. Images were projected on the fly from NAD 83 UTM Zone 13 North to NAD 83 North Dakota North State Plane. Aerial photos included several referencing points through refinement and distorted areas were clipped on the periphery of the images.
Photos were inspected and clipped to remove highly distorted areas. Clipping the images on the far edge of the photos removed warping and creases; this is a legacy of scanning paper maps. Areas extending one mile outside of the draft OHWM were clipped.
Georeferenced photos started at the western edge of the project area and continued east to New Town. Approximately 30 to 50 control points were placed manually to reference each image. Road crossings, farmsteads, and rock outcrops were used to reference the 1951 imagery to the 2016 NAIP photos. To help with edge matching, auto-referencing was used to place high concentrations of similar points on adjacent photos. When auto-referencing was used, the amount of control points significantly increased. Auto-reference points with high residuals were deleted. A second or third order polynomial transformation was used to fit the 1951 photo to the 2016 photo. The photo was checked for distortion and warping; control points were adjusted accordingly to minimize image distortion.
The single frame photos were mosaiced together to create a seamless image for the project area and stored in a file geodatabase. The file geodatabase utilizes ESRI’s ArcGIS.
Map Name: ImageCache
Legend
All Layers and Tables
Dynamic Legend
Dynamic All Layers
Layers:
Description: test
Copyright Text: DMR, ND GIS Hub
Spatial Reference:
102100
(3857)
Single Fused Map Cache: false
Initial Extent:
XMin: -1.1573642468716795E7
YMin: 6043776.047415313
XMax: -1.1398013410845874E7
YMax: 6193974.653467822
Spatial Reference: 102100
(3857)
Full Extent:
XMin: -1.1561857297419794E7
YMin: 6101156.717434798
XMax: -1.1415159148156218E7
YMax: 6135479.669671823
Spatial Reference: 102100
(3857)
Units: esriMeters
Supported Image Format Types: PNG32,PNG24,PNG,JPG,DIB,TIFF,EMF,PS,PDF,GIF,SVG,SVGZ,BMP
Document Info:
Title: Untitled.aprx
Author:
Comments: test
Subject: test
Category:
Keywords: aerial,photos,OHWM
AntialiasingMode: Fast
TextAntialiasingMode: Force
Supports Dynamic Layers: true
Resampling: false
MaxRecordCount: 2000
MaxImageHeight: 4096
MaxImageWidth: 4096
Supported Query Formats: JSON, geoJSON, PBF
Supports Query Data Elements: true
Min Scale: 0
Max Scale: 0
Supports Datum Transformation: true
Child Resources:
Info
Dynamic Layer
Supported Operations:
Export Map
Identify
QueryLegends
QueryDomains
Find
Return Updates