Accuracy of LCDB2
Summary
- There are 6 posts — by 4 authors — in this topic.
-
Posts with files From File Date fiona 2010 Jul 12 13:38 NZST - Latest post made by Frances Schmechel at 2010 Jul 12 16:15 NZST
Hi All, I'm using LCDB2 for some land cover analysis and am trying to get my hands on any (of what appears to be limited) documentation about its boundary or classification accuracy. The metadata states "The database is released with an accuracy assessment completed for that part of the database covering Marlborough District." But then it doesn't actually state what the outcome of that assessment was. I can't seem to find this accuracy assessment on the web. Can anyone point me in the right direction? Also I'm espcially keen to hear from any users of LCDB2 who have some measure of its accuracy in your area of interest - especially if you have documented this. Thanks Derek Derek G.L. Phyn | GIS Officer | Spatial Analysis and Modelling Services Environment Waikato P: +64 7 859 0826 F: +64 7 859 0998 PO Box 4010, Hamilton East, Hamilton 3247 Please consider the environment before printing this email ********************************************************************** This email message and any attached files may contain confidential information, and may be subject to legal professional privilege. If you have received this message in error, please notify us immediately and destroy the original message. Any views expressed in this message are those of the individual sender and may not necessarily reflect the views of Environment Waikato. Environment Waikato makes reasonable efforts to ensure that its email has been scanned and is free of viruses. However, Environment Waikato can make no warranty that this email or any attachments to it are free from viruses. Visit our website at http://www.ew.govt.nz **********************************************************************
We have information held in our metadata for the accuracy of the lcdb2 for Hawkes Bay. This was supplied with the database and should be on the CD you received. I have attached our copy for you. Cheers, Fiona
The following file was added to this topic:
Thanks Fiona, There's a useful statement about boundary accuracy in there but I'm still looking for measures of classification accuracy.
Cheers
Derek
-----Original Message-----
From: <email obscured>
<email obscured>] On Behalf Of fiona
Sent: Monday, 12 July 2010 1:39 p.m.
To: <email obscured>
Subject: [dataversity public discussion] Accuracy of LCDB2
― Attachment links are at the end of this email ―
We have information held in our metadata for the accuracy of the lcdb2 for
Hawkes Bay. This was supplied with the database and should be on the CD you
received. I have attached our copy for you.
Cheers, Fiona
Dataversity Public Discussion now contains the following file
http://dataversity.org.nz/r/file/8034-2010-07-12T013806Z
Name: METADATA.DOC
Type: application/msword
Size: 24KB
-----------------------------------------
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Robert Gibb from our Palmerston North office offers the following ... " ... there was no official accuracy assessment [of LCDB2]. However the Marlborough pilot study included an accuracy assessment, which may or may not be applicable to the final dataset. "
Jerry
-----Original Message-----
From: <email obscured>
<email obscured>] On Behalf Of Derek Phyn
Sent: Monday, 12 July 2010 1:57 p.m.
To: <email obscured>
Subject: Re: [dataversity public discussion] Accuracy of LCDB2
Thanks Fiona,
There's a useful statement about boundary accuracy in there but I'm still
looking for measures of classification accuracy.
Cheers
Derek
-----Original Message-----
From: <email obscured>
<email obscured>] On Behalf Of fiona
Sent: Monday, 12 July 2010 1:39 p.m.
To: <email obscured>
Subject: [dataversity public discussion] Accuracy of LCDB2
― Attachment links are at the end of this email ―
We have information held in our metadata for the accuracy of the lcdb2 for
Hawkes Bay. This was supplied with the database and should be on the CD you
received. I have attached our copy for you.
Cheers, Fiona
Dataversity Public Discussion now contains the following file
http://dataversity.org.nz/r/file/8034-2010-07-12T013806Z
Name: METADATA.DOC
Type: application/msword
Size: 24KB
-----------------------------------------
Full text of this topic in Dataversity Public Discussion:
http://dataversity.org.nz/r/topic/mLDMELgMkEH22yhE7H30n
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Thanks Jerry, As per my original email... "The metadata for LCDB2 states "The database is released with an accuracy assessment completed for that part of the database covering Marlborough District." But then it doesn't actually state what the outcome of that accuracy assessment was. I can't seem to find this accuracy assessment on the web. Can anyone point me in the right direction?" Also from Seyed Miri... "The Marlborough accuracy assessment was not comprehensive as this area was the first completed region and its quality was not as good as other regions. At the end of the LCDB2 project, it was suggested that the MDC_LCDB2 map go through a quality check but there was not enough budget to do so..." The mystery deepens about this Marlborough District accuracy assessment. Still looking for a good lead to the actual results.
Cheers
Derek
-----Original Message-----
From: <email obscured>
<email obscured>] On Behalf Of Jerry
Cooper
Sent: Monday, 12 July 2010 2:04 p.m.
To: <email obscured>
Subject: Re: [dataversity public discussion] Accuracy of LCDB2
Robert Gibb from our Palmerston North office offers the following ...
" ... there was no official accuracy assessment [of LCDB2]. However the
Marlborough pilot study included an accuracy assessment, which may or may not
be applicable to the final dataset. "
Jerry
-----Original Message-----
From: <email obscured>
<email obscured>] On Behalf Of Derek Phyn
Sent: Monday, 12 July 2010 1:57 p.m.
To: <email obscured>
Subject: Re: [dataversity public discussion] Accuracy of LCDB2
Thanks Fiona,
There's a useful statement about boundary accuracy in there but I'm still
looking for measures of classification accuracy.
Cheers
Derek
-----Original Message-----
From: <email obscured>
<email obscured>] On Behalf Of fiona
Sent: Monday, 12 July 2010 1:39 p.m.
To: <email obscured>
Subject: [dataversity public discussion] Accuracy of LCDB2
― Attachment links are at the end of this email ―
We have information held in our metadata for the accuracy of the lcdb2 for
Hawkes Bay. This was supplied with the database and should be on the CD you
received. I have attached our copy for you.
Cheers, Fiona
Dataversity Public Discussion now contains the following file
http://dataversity.org.nz/r/file/8034-2010-07-12T013806Z
Name: METADATA.DOC
Type: application/msword
Size: 24KB
-----------------------------------------
Full text of this topic in Dataversity Public Discussion:
http://dataversity.org.nz/r/topic/mLDMELgMkEH22yhE7H30n
To leave Dataversity Public Discussion, email
<email obscured>?Subject=unsubscribe
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**********************************************************************
This email message and any attached files may contain confidential information,
and may be subject to legal professional privilege. If you have received this
message in error, please notify us immediately and destroy the original
message. Any views expressed in this message are those of the individual
sender and may not necessarily reflect the views of Environment Waikato.
Environment Waikato makes reasonable efforts to ensure that its email has been
scanned and is free of viruses. However, Environment Waikato can make no
warranty that this email or any attachments to it are free from viruses. Visit
our website at http://www.ew.govt.nz
**********************************************************************
-----------------------------------------
Full text of this topic in Dataversity Public Discussion:
http://dataversity.org.nz/r/topic/1omi2WFFa7gmY9OPMLtdZV
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Please consider the environment before printing this email
Warning: This electronic message together with any attachments is
confidential. If you receive it in error: (i) you must not read, use, disclose,
copy or retain it; (ii) please contact the sender immediately by reply email
and then delete the emails. The views expressed in this email may not be those
of Landcare Research New Zealand Limited. http://www.landcareresearch.co.nz
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Hi Derek, Assume you've seen the paper by Ecki Brockerhoff et al. in the NZ J Ecol (Re-examination of recent loss of indigenous cover in New Zealand and the relative contributions of different land uses)? If not, it has quite a bit on class accuracy of LCDB2 (and LCDB1) (in the table and also in the text), discussion of issues, and a few relevant references to other sources of information on this. Try this link for the paper: http://www.nzes.org.nz/nzje/new_issues/NZJEcol32_1_115.pdf New Zealand Journal of Ecology (2008) 32(1): 115-126
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