warrnambool_1947jan18_air_vis_42cm_mga54

dataset: warrnambool_1947jan18_air_vis_42cm_mga54.ecw

Abstract This project represents a timeslice series of historical aerial photography datasets around Warrnambool-Mepunga, Kingston, Latrobe Valley and Mallacoota from the 1930's to the 1990's.The purpose of creating the ortho photo mosaics was to detect and measure changes (long term, progressive or cyclic). The type of shoreline change the photography aimed to identify included sandy beach-dune, scarped 'soft-rock', muddy mangrove shores and asset removal/construction. A secondary purpose of the photography was to map the change of vegetation. To achieve the purpose, a time series of repeated aerial photography was planned with epoch intervals of approximately 10 years (and a minumum of five years separation). The seven epochs planned for were 1930's,1940's,1950's,1960's,1970's 1980's and 1990's. For any given epoch where the study area was not covered completely by a historic photography project (series of air-photos taken on the same date or within a few days of each other) then the next most recent photography project was identified, processed and used for comparison. The aim was to keep each epoch as close as possible, This data is only available for Whole of Victorian Government use.

Citation proposal Citation proposal

warrnambool_1947jan18_air_vis_42cm_mga54

Department of Transport and Planning

https://metashare.maps.vic.gov.au/geonetwork/srv/eng/catalog.search#/metadata/dd57d9da-0f50-5653-a42d-ea2776d98273

Details

Contacts

Cited responsible party

No information provided.

Point of contact

Department of Transport and Planning - Coordinated Imagery Program

PO Box 500

East Melbourne

Victoria

3002

Australia

Identifiers and Keywords

ANZLIC Id: ANZVI0008107210

Topic category

Imagery base maps earth cover
Elevation

Resource Constraints

Use limitation: State Government Use Only

Classification: Restricted

Other Dataset Details

Format: ECW, TIFF

Supplemental Information: ANZVI0008107210, ANZVI0008107905 For non government state agencies the original photography can be accessed via the Landata website, https://www.landata.vic.gov.au/tpc_from_landataonline.aspx

Maintenance and update frequency: Unknown

Spatial

Spatial representation type: Grid

Reference system identifier: MGA Zone 54 GDA94

Quality

Positional Accuracy: ±1m RMSE (68%)

Lineage

Statement: Step 1 DEM production – placing contours over supplied DEM to check for distortions and correct where necessary. Primary aim to provide accurate orthophoto images, not a precision elevation data set. Step 2 Control selection from modern photography to ensure points able to be seen on selected historical images Step 3 Aerial triangulation - Automatic point measurement and bundle adjustment using Metashape Step 4 Rectification - Produce Orthophotos using Leica XPro RectifierTM Step 5 Colour balance imagery Step 6 Match joins – Produce Orthophoto using either Leica LPS and ERDAS ImagineTM / ER MapperTM Step 7 Deliverable’s Create outputs as per specifications The source photography and selection of frames was made for each mosaic based on similarity of scale, capture dates, best image clarity available and epoch representation. The source frame photography (in digital format) was previously scanned from analog film negatives scanned at 12um or 15um or, scanned from photography prints at 800dpi. The production order of the ortho-photo mosaics was generally from the most recent to oldest imagery (i.e 1990’s working back to the 1930’s). Modern imagery (within 10 years of 2018) of high accuracy and high detail was used as control as well as image control and verification points with the previously produced image epoch.

Acquisition Date

Acquisition Data (Common)

Status: complete

Assembly: Mosaic

Tile Size: 1 km

Raster Details

Number of Bands: 3

Band List: 1,2,3

Platform Name: Fixed Wing Aircraft

Seamlessness: Partial

Rectification Type: Orthorectified

Rectification Notes: fim scanned at 15um, camera used was Eagle 4 with a focal length of 239mm Metadata lists flight height at 3800m, but it may be agi feet. Film numbers 609,611,612,613,614,000, Flight charts photo scale is 25000.

Aerial Survey Details

Runs: 19

Run Orientation: E-W

Side Overlap: 60

Forward Overlap: 90

Flying Height Unit: agl feet

Flight Height: 3800

About the Metadata Record

Metadata identifier: urn:uuid / dd57d9da-0f50-5653-a42d-ea2776d98273

Processor

DTP - Hart, Chay

Contact