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Correction

Correction: Brodzik, M.J., et al. EASE-Grid 2.0: Incremental but Significant Improvements for Earth-Gridded Data Sets. ISPRS International Journal of Geo-Information 2012, 1, 32–45

National Snow & Ice Data Center, Cooperative Institute of Environmental Sciences, University of Colorado, 449 UCB, Boulder, CO 80309, USA
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Author to whom correspondence should be addressed.
ISPRS Int. J. Geo-Inf. 2014, 3(3), 1154-1156; https://doi.org/10.3390/ijgi3031154
Submission received: 10 September 2014 / Accepted: 10 September 2014 / Published: 24 September 2014
We wish to make the following corrections to this paper [1]:
(1) The right hand side of Figure 5 is incorrect.
Figure 5. Relative gridding schemes for representative azimuthal 25 km and 12.5 km original EASE-Grid ((Left), bore-centered) vs. EASE-Grid 2.0 ((Right), nested) cells near the pole.
Figure 5. Relative gridding schemes for representative azimuthal 25 km and 12.5 km original EASE-Grid ((Left), bore-centered) vs. EASE-Grid 2.0 ((Right), nested) cells near the pole.
Ijgi 03 01154 g001
The pole should be at the intersection of the center four 25 km cells. This is the corrected Figure 5:
Figure 5. Relative gridding schemes for representative azimuthal 25 km and 12.5 km original EASE-Grid ((Left), bore-centered) vs. EASE-Grid 2.0 ((Right), nested) cells near the pole.
Figure 5. Relative gridding schemes for representative azimuthal 25 km and 12.5 km original EASE-Grid ((Left), bore-centered) vs. EASE-Grid 2.0 ((Right), nested) cells near the pole.
Ijgi 03 01154 g002
(2) The scale of 25,025.2600081 m for the 25 km cylindrical EASE-Grid 2.0 causes some mapping software to transform locations along the left edge to longitude 180.0 and locations along the right edge to −180.0. The desirable behavior is to transform the left edge to longitude −180.0 and the right edge to longitude 180.0. We have therefore decided to define the 25 km cylindrical EASE-Grid 2.0 scale to be 25,025.2600000, which corrects the problem.
(3) In Appendix A, to clarify the Azimuthal EASE-Grid 2.0 Forward Formulae, we add the following symbol to the Definition section:
ϵ = 10.0−12; constant used to avoid taking square root of a negative number in Equation (10).
and replace the Azimuthal EASE-Grid Forward Formulae Definition with:
Definition (Azimuthal EASE-Grid 2.0 Forward Formulae ([26], pp. 187−188)). Use q(ϕ) from Equation (2), and let
qp = q(ϕ = 90°)
Ijgi 03 01154 i001
then
x = ρsin (λλ0)
Ijgi 03 01154 i002
Furthermore, in Equations (15) and (17), the following changes should clarify the cases for each hemisphere:
Replace “if North” with “if ϕ0 = 90°”
Replace “if South” with “if ϕ0 = −90°”
(4) Finally, there was a typographical error in Appendix C, Table 2, in the PROJ.4 arguments for the EASE-Grid 2.0 cylindrical projection definition. The corrected PROJ.4 arguments for the EASE-Grid 2.0 cylindrical projection definition are:
+proj=cea +lat_0=0 +lon_0=0 +lat_ts=30 +x_0=0 +y_0=0 +ellps=WGS84 +datum=WGS84 +units=m
We apologize if these errors caused any inconvenience to the readers.

Reference

  1. Brodzik, M.J.; Billingsley, B.; Haran, T.; Raup, B.; Savoie, M.H. EASE-Grid 2.0: Incremental but significant improvements for Earth-Gridded data sets. ISPRS Int. J. Geo-Inf. 2012, 1, 32–45. [Google Scholar]

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MDPI and ACS Style

Brodzik, M.J.; Billingsley, B.; Haran, T.; Raup, B.; Savoie, M.H. Correction: Brodzik, M.J., et al. EASE-Grid 2.0: Incremental but Significant Improvements for Earth-Gridded Data Sets. ISPRS International Journal of Geo-Information 2012, 1, 32–45. ISPRS Int. J. Geo-Inf. 2014, 3, 1154-1156. https://doi.org/10.3390/ijgi3031154

AMA Style

Brodzik MJ, Billingsley B, Haran T, Raup B, Savoie MH. Correction: Brodzik, M.J., et al. EASE-Grid 2.0: Incremental but Significant Improvements for Earth-Gridded Data Sets. ISPRS International Journal of Geo-Information 2012, 1, 32–45. ISPRS International Journal of Geo-Information. 2014; 3(3):1154-1156. https://doi.org/10.3390/ijgi3031154

Chicago/Turabian Style

Brodzik, Mary J., Brendan Billingsley, Terry Haran, Bruce Raup, and Matthew H. Savoie. 2014. "Correction: Brodzik, M.J., et al. EASE-Grid 2.0: Incremental but Significant Improvements for Earth-Gridded Data Sets. ISPRS International Journal of Geo-Information 2012, 1, 32–45" ISPRS International Journal of Geo-Information 3, no. 3: 1154-1156. https://doi.org/10.3390/ijgi3031154

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