Dear Lena, Many thanks for your suggestions to improve the definition of the primary_and_secondary_land area type. I'm happy to accept most of your suggestions. The only bit I remain unsure about is the sentence you say may still need refining: '"Primary land" is land that has not been subjected to human disturbance (in the context of simulation and/or LULCC scenario).' What does LULCC stand for? I assume it's something like Land Use / Land Change Climate scenario - but that's just me guessing! Also, it seems to suggest that primary_and_secondary_land is very much a modelling concept - is that really true or would the classification also be applied to datasets of actual land use?
Best wishes, Alison ------ Alison Pamment Tel: +44 1235 778065 Centre for Environmental Data Analysis Email: [email protected] STFC Rutherford Appleton Laboratory R25, 2.22 Harwell Campus, Didcot, OX11 0QX, U.K. From: Elena Shevliakova [mailto:[email protected]] Sent: 26 January 2017 14:24 To: David Lawrence; Pamment, Alison (STFC,RAL,RALSP) Cc: [email protected] Subject: RE: New area_types for LUMIP subgrid land-use tile reporting Hi Alison, a couple of suggestions for "primary and secondary", mostly simplifying: It's challenging to give a short and clear definition - remove "all vegetated"- because it applies to bare as well - remove "active" - some croplands left fallow for a year or two but they are not secondary - clarify "primary" in the context of simulation/LULCC scenario - this may require some refinement. Some people argue for example that Amazon was managed by natives...never is a strong word - I would not bring up primary or secondary trees - I think it may confuse people. we can ever to primary and secondary succession plants species. ' "Primary and secondary land" is land that is not in use as cropland or pastureland, including forests, grasslands, bare ground and vegetated wetlands. "Primary land" is land that has not been subjected to human disturbance (in the context of simulation and/or LULCC scenario). "Secondary land" is land that previously used for agriculture, urban or logging and has been abandoned. Reference: Hurtt et al. (2011), Climatic Change, 109 - 117, Harmonization of land-use scenarios for the period 1500-2100: 600 years of global gridded annual land-use transitions, wood harvest, and resulting secondary lands, doi: 10.1007/s10584-011-0153-2. "Primary and secondary land" refers to a land use or management rather than to specific categories of vegetation cover, e.g. the primary and secondary succession plants species.' ________________________________________ From: David Lawrence [[email protected]] Sent: Wednesday, January 25, 2017 9:49 PM To: Alison Pamment Cc: Elena Shevliakova; [email protected] Subject: Re: New area_types for LUMIP subgrid land-use tile reporting Hi Alison, The primary and secondary land definition looks good. The urban definition seems a bit excessive for these purposes. I suggest simplifying to: Urban land is comprised of areas where much of the land is covered by structures. Included in this category are cities, towns, and villages. The reference is still suitable. Dave On Wed, Jan 25, 2017 at 9:48 AM, <[email protected]> wrote: Dear David and Lena, I will shortly be making an update to the CF area_types table and I will be adding the changes we agreed previously: http://mailman.cgd.ucar.edu/pipermail/cf-metadata/2016/059111.html. I have found what appears to be a reasonable definition for 'urban' which I have quoted straight from the given reference. Is this OK or can you point me to a more recent reference, perhaps one with a doi? primary_and_secondary_land ' "Primary and secondary land" is all vegetated land that is not in active use as cropland or pastureland, including forests, grasslands, bare ground and vegetated wetlands. "Primary land" is land that has never been subjected to human disturbance. "Secondary land" is land that has undergone human disturbance and has either subsequently been abandoned or is currently being managed for human use (e.g., wood harvest). Reference: Hurtt et al. (2011), Climatic Change, 109 - 117, Harmonization of land-use scenarios for the period 1500-2100: 600 years of global gridded annual land-use transitions, wood harvest, and resulting secondary lands, doi: 10.1007/s10584-011-0153-2. "Primary and secondary land" refers to a land use, rather than to specific categories of vegetation, and is distinct from the area types for primary and secondary trees.' pastures 'Pastures are assumed to be anthropogenic in origin. They include anthropogenically managed pastureland and rangeland.' urban 'Urban or Built-up Land is comprised of areas of intensive use with much of the land covered by structures. Included in this category are cities, towns, villages, strip developments along highways, transportation, power, and communications facilities, and areas such as those occupied by mills, shopping centers, industrial and commercial complexes, and institutions that may, in some instances, be isolated from urban areas. Reference: Anderson, J.R, E. E. Hardy, J. T. Roach and R. E. Witmer (1976), A Land Use And Land Cover Classification System For Use With Remote Sensor Data, Appendix C Land Use Defintions, Geological Survey Professional Paper 964, A revision of the land use classification system as presented in U.S. Geological Survey Circular 671, https://www.usbr.gov/lc/socal/reports/SMappend_C.pdf.' Best wishes, Alison ------ Alison Pamment Tel: +44 1235 778065 Centre for Environmental Data Analysis Email: [email protected] STFC Rutherford Appleton Laboratory R25, 2.22 Harwell Campus, Didcot, OX11 0QX, U.K. _______________________________________________ CF-metadata mailing list [email protected] http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
