March 11 - Flying begins for both Lidar and imagery
April 18 - Imagery and Lidar collection completed
March 7 – Tile delivery grid finalized
May - Pilot imagery tiles received by CRCOG
June - QA/QC Firm selected to do independent review
June – Pilot lidar tiles received by CRCOG
November – Decision made to get two types of MrSID (generation 3 and generation 4) to meet needs or all users
December - Imagery tiles for blocks 1, 3, 5, 7 (western half of the state) approved by QA/QC process
December 29 – UConn receives Blocks 1, 3, 5, 7 imagery tiles and begins processing
January – Imagery tiles for blocks 2, 4 (eastern half, south and central) approved by QA/QC process
January 24 – Imagery tiles for blocks 2, 4 (eastern half, south and central) received by UConn
February 10 - all imagery approved by QA/QC process
February 13 - Imagery tiles for block 6, the last one, (northeast) received by UConn
Note that the QA/QC process is very important and has been thorough. It has delayed the original timeline a bit.
23,381 tiles covering Connecticut. Each tile is 2500ft on a side or 0.224 sq miles, 143.5 acres and 6,250,000 sq feet.
Statewide. 4 bands (red, green, blue, near-infrared). 3 inch pixels. GeoTIFFs. MrSIDs Generation 3 and Generation 4. CT State Plane NAD 83 Feet. XX TB of GeoTIFFs and XX GB of MrSIDs (Generation 3 is xx and Generation xx is ). Captured in March and April 2016 (leaf off). Tide coordinated.
Statewide. USGS Quality Level 2. 2 points per sq meter. Ground/non-ground classification. LAS files (point cloud). Bare earth 1m pixel raster tiles (called a Digital Elevation Model or DEM). 1 foot and 5 foot contours derived from Lidar. Intensity images. Captured in March and April 2016 (leaf off). Tide coordinated.
|GeoTIFF||Highest quality image available here but also the largest file size by a lot.|
|MrSID Generation 4||Compressed image file that supports all 4 image bands (blue, green, red, near-infrared)|
|MrSID Generation 3||Compressed image file with the smallest file size because it contains only 3 image bands (blue, green, red)|
TIFF or TIF stand for Tagged Image File Format and is used for storing raster images of all kinds. Geo indicates that the TIF has a word file, called TWF that stores geographic information about the raster file.
MrSID stands for MultiresolutionSeamless Image Database. It is a way of compressing imagery so that it can be quickly viewed. LizardTech pioneered the MrSID technology. With each Generation, LizardTech has improved the functions of the MrSID files. MrSID Generation 3 improved upon Generation 2 by supporting unlimited files sizes, lossless encoding with optimization and manipulation options. MrSID Generation 4 improved upon Generation 3 by supporting multi-spectral and hyper-spectral imagery and an improved mechanism for composite mosaicking. Read the full explanation on the LizardTech website.
|Block||Number of Tiles||File size: GeoTIFF||File Size: MrSID Gen 3||File Size: MrSID Gen 4||File Size: DEM|
|1||3881||1.41 TB||54.2 GB||72.4 GB|
|2||4169||1.51 TB||58.2 GB||77.7 GB|
|3||3239||1.15 TB||45.2 GB||60.4 GB|
|4||3200||1.16 TB||44.7 GB||59.6 GB|
|5||3061||1.11 TB||42.8 GB||57.0 GB|
|6||3617||1.31 TB||50.5 GB||67.4 GB|
|7||2214||825 GB||30.9 GB||41.2 GB|
|TOTAL||23,381||8.475 TB||326.5 GB||435.7 GB|