Open AccessCorrection

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

Mary J. Brodzik

^*,

Brendan Billingsley

Terry Haran

Bruce Raup

and

Matthew H. Savoie

National Snow & Ice Data Center, Cooperative Institute of Environmental Sciences, University of Colorado, 449 UCB, Boulder, CO 80309, USA

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

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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.

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.

(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

q_p = q(ϕ = 90°)

(9)

(10)

then

x = ρsin (λ − λ₀)

(11)

(12)

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

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]

© 2014 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).

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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

APA Style

Brodzik, M. J., Billingsley, B., Haran, T., Raup, B., & Savoie, M. H. (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(3), 1154-1156. https://doi.org/10.3390/ijgi3031154

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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

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