Identification

Title

Orthophoto High Compression 0.25m resolution Mosaic - 2012 - Calvert Island

Abstract

This lightweight mosaic of 2012 orthophotos covering the entire Calvert Island at 0.25m resolution was created from 589 individual orthophotos covering the entire extent of Calvert Island. JPEG200 compression has been utilized to create this mosaic dataset. This mosaic was created with the intent to provide Hakai researchers, staff and collaborators with a "lightweight" single imagery file which provides coverage for the entire Calvert Island at very high resolution. By employing the JPEG2000 compression, the mosaic has been reduced to >1/4 of the total size that would be obtained by mosaicking all the individual orthophotos in their native TIFF format. While it is expected that such a high compression mechanism would have an impact on the quality of the imagery, the end result in this mosaic is hardly distinguishable visibly from the original air photos. The air photos / orthophotos were acquired by Hakai through Terra Remote Sensing - CEDD Lab UVic - Hyperspectral Lab UVic. These orthophotos have the highest available spatial resolution that covers the entire Calvert / Hecate area. Major efforts were used to process individual orthophotos to have a seamless look by the CEDD Lab UVic. Gaps (shown in black) exist in some areas where the sensors used to capture the images were obscured or occluded.

Resource type

dataset

Resource locator

https://hecate.hakai.org/auth/access-request.php#

protocol: WWW:LINK-1.0-http--link

name: Hakai Data Access Online Request Form

description: Online form for requesting access to particular datasets owned by Hakai.

https://drive.google.com/open?id=0B-Q2IQtbEgU4UU12ZDRhUXBxUW8

protocol: WWW:LINK-1.0-http--link

name: Hakai Geospatial Data Repository (Restricted Access)

description: Hakai's repository for downloading raw data files. Restricted Access.

Unique resource identifier

code

https://hecate.hakai.org/geonetwork/srv/metadata/1946cc53-6e11-4428-a2c9-43b34e1dcaa1

codeSpace

Dataset language

eng

Spatial reference system

authority code

EPSG

code identifying the spatial reference system

3857

Classification of spatial data and services

Topic category

imageryBaseMapsEarthCover

Keywords

Keyword set

keyword value

Downloadable Data

originating controlled vocabulary

Keyword set

keyword value

Air Photo

Orthophoto

Imagery

Calvert Island

Mosaic

Geographic location

West bounding longitude

-128.16651

East bounding longitude

-127.854745

North bounding latitude

51.74304

South bounding latitude

51.402002

Temporal reference

Temporal extent

Begin position

End position

Dataset reference date

date type

creation

effective date

2014-02-07

date type

publication

effective date

2015-09-22

Frequency of update

notPlanned

Quality and validity

Lineage

Conformity

Data format

name of format

Raster Dataset

version of format

JPEG 2000

Constraints related to access and use

Constraint set

Use constraints

Appropriate credit must be given to Hakai Institute and the authors of the dataset.

Responsible organisations

Responsible party

organisation name

Hakai Institute

full postal address

1002 Wharf Street - Suite 100

Victoria

V8W1T4

telephone number

+1 (250) 590 3306

email address

data@hakai.org

responsible party role

pointOfContact

Responsible party

contact position

organisation name

Hakai Institute

full postal address

telephone number

email address

responsible party role

processor

Metadata on metadata

Metadata point of contact

contact position

organisation name

Hakai Institute

full postal address

telephone number

email address

responsible party role

author

Metadata date

2018-02-06T19:55:20

Metadata language

eng