created by denver harper (igs) chris dintaman (igs) alex zlotin (esri)
DESCRIPTION
Indiana Geological Survey (IGS). Created by Denver Harper (IGS) Chris Dintaman (IGS) Alex Zlotin (ESRI). Funded by Indiana Dept. of Transportation (INDOT). Collected by the Soil Conservation Service (NRCS) of the U.S.D.A. Started in late 1930s Collected as county-based surveys - PowerPoint PPT PresentationTRANSCRIPT
Created byDenver Harper (IGS)Chris Dintaman
(IGS)Alex Zlotin (ESRI)Funded by Indiana Dept. ofTransportation(INDOT)
Indiana Geological Survey (IGS)
Collected by the Soil Conservation Service (NRCS) of the U.S.D.A.
Started in late 1930s
Collected as county-based surveys
Used for agricultural and topographic mapping
Compiled in various archival collections
Size = 9 x 9 inches
Date of collection
Unique ID number
Significant overlap for stereo viewing
Usually N-S flight lines
Several hundred photos per county per year
Created to facilitate retrieval
Individual photos were physically mosaicked and then re-photographed
Photomosaics are low-resolution
951 photo-mosaic index maps, showing locations of 113,035 individual photos
39,992 individual photos
2005 - Scanned by Historical Information Gatherers, Inc.• Photomosaics scanned at 300 dpi• Individual photos scanned at 600 dpi• Scans of individual photos are not available
for public distribution• Upon request, IGS personnel will re-scan
individual photos at 800 dpi
2006 – Photomosaics georeferenced by IGS• ArcGIS georeferencing tool• Leica Image Analyst extension for ArcGIS
used to mosaic index maps that were split into parts
• Loaded into SDE as raster catalog
2007 - Point index layer completed by IGS• A point was placed
over each ID number on each photomosaic (113,035 points)
• Each point was attributed with county name, year, photo ID, flight orientation, and availability from various archives
• Loaded into SDE
2007-2008 - IHAPI interactive map was developed and made public on January 23
Purpose: Create an interactive map, so that the public can obtain historical aerial photos of interest without leaving their home or office.
IHAPI Features• ESRI ArcIMS AXL-based map service• Customized definition queries are accessed
through the user interface to display the photomosaics and ID points
• Customized interface to assist users in finding their site of interest
Read the instructions or watch the narrated video tutorial
Open the interactive map (http://igs.indiana.edu/IHAPI)
Specify your county of interest
Select your year of interest
Find your site of interest• Zoom tools• Locate by address or coordinates• Reference layers
Determine identification number
Contact archival collections (such as IGS) for copies of high-resolution photos
Http://igs.indiana.edu/IHAPI
Find historical aerial photos showing the site of the football stadium of Indiana University