Salt Marsh Habitats, New Hampshire, 2013

This data set consists of salt marsh habitats for the state of New Hampshire derived from high resolution (1ft) imagery collected on August 24, 2013. This data set relied on 4 Band multispectral aerial orthoimagery acquired by the Piscataqua Region Estuaries Partnership and LiDAR data collected through the LiDAR for the NorthEast project (2011).

To gauge the health and resilience of New Hampshire's coastal salt marshes and provide baseline data for detecting change over time.

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Attributes for this product are as follows:

0 Background,

1

2

3

4

5 Invasive Phragmites australis,

6

7 S.patens / D.spicata,

8 Mud flat /Bare,

9

10 Open water,

11 Pannes and Pools,

12

13 Salicornia spp.,

14 Salt marsh terrestrial border,

15 Short form S. alterniflora,

16 High Marsh, S. alterniflora / Lower salt meadow mixture,

17

18

19 Low Marsh,

20

21

22 Brackish Meadow,

23 High Marsh, J. gerardii,

24 Wrack,

25 Recently Flooded Upland Border

5 years

Users must assume responsibility to determine the usability of these data.

None

Data set is not for use in litigation. While efforts have been made to ensure that these data are accurate and reliable within the state of the art, NOAA, cannot assume liability for any damages, or misrepresentations, caused by any inaccuracies in the data, or as a result of the data to be used on a particular system. NOAA makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty.

Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 9.2.2.1350

According to accuracy assessment performed by the Great Bay NERR , the overall accuracy for the classification is % and Kappa. There were 353 total points distributed across the state. The accuracy of each class is as follows (Producer's, User's accuracies):

Invasive Phragmites australis (%, %)

High Marsh, S.patens / D.spicata (%, %)

Mud flat /Bare (%, %)

Open Water (%, %)

Pannes and Pools (%, %)

Salicornia (%, %)

Salt marsh terrestrial border (%, %)

S. alterniflora (%, %)

High Marsh, S. alterniflora / Lower salt meadow mixture (%, %)

Low marsh (%, %)

Brackish (%, %)

High Marsh, J. gerardii (%, %)

Wrack (%, %)

Recently Flooded Upland Border(%, %)

Overall accuracy (%)

Tests for logical consistency indicate that all row and column positions in the selected latitude/longitude window contain data. Conversion and integration with vector files indicates that all positions are consistent with earth coordinates covering the same area. Attribute files are logically consistent.