PHOTOGRAMMETRIC ENGINEERING & REMOTE SENSING
October 2019
711
nese Geodetic Datum 2000 (JGD2000). The
National Imagery and Mapping Agency
(NIMA) reports in Technical Report 8350.2
(January, 2000) that the transformation
(for Japan) from Tokyo 1918 to WGS84 is
∆a = 739.845, ∆
f
× 10
4
= 0.10037483, ∆
X
= –148m±8m, ∆
Y
= –507m ±5m, and ∆
Z
= –685m±8m.
U
pdate
Japan now has a GPS network established
with a density of about 20 km used pri-
marily for an earthquake warning system.
The new published transformation pa-
rameters from Tokyo97 Datum to ITRF94
are: ∆X = +147.414 m, ∆Y = –507.337 m,
∆Z = –680.507 m. Thanks to Prof. Ka-
zuo Kobayashi, “the lowest point in Ja-
pan is the middle of the Seikan Tunnel
at –256.5674m. The history of Japanese
Datum leveling above Mean Sea Level at
Tokyo Bay at “1-chome Nagatacho, Chiy-
okaku, Tokyo in 1894 = 24.5000m, in 1923
= 24.4140m and in 2011 = 24.3900m.”
The Geospatial Information Authority of Ja-
pan (GSI) has published extensive informa-
tion on their data in English:
•
There is a detailed preface:
•
Concept of the New Japanese Geodetic
System:
•
ThenewHeightSystemofJapan:
•
AndDevelopmentofanewGeoid:
The contents of this column reflect the views of the
author, who is responsible for the facts and accu-
racy of the data presented herein. The contents do
not necessarily reflect the official views or policies
of the American Society for Photogrammetry
and Remote Sensing and/or the Louisiana State
University Center for GeoInformatics (C
4
G).
This column was previously published in
PE&RS
.
Ad Index
Resonon
|
|
share their data as analysis-ready data services, and as more online analytical
tools are developed and made accessible for free, and more disruptive machine
learning and other Artificial Intelligence (AI) approaches are leveraged, the
future could be very different from the past. Simply stated, it will be much
more inclusive – both in terms of the diversity of data sources and analysis tech-
niques, and in terms of broadening the user base, including a range of non-tech-
nical users, although it will still require a great deal of technical expertise to
produce the information and visualizations. These services can be made more
global, providing economies of scale in development, facilitating partnerships,
and expanding the user base beyond just a few with access to the data and tools
to virtually anyone with a smartphone or similar device.
These kinds of platforms could move beyond being data/analytic service cat-
alogs to become powerful customized decision support tools that leverage the
services for use on any smartphone or tablet or other digital devices that even
the poorest countries, institutions or people can leverage to make more infor-
mation-based decisions and benefit from this rapidly-accelerating disruptive
technology age.
The ASPRS community welcomes any feedback.
Author
Nagaraja Rao Harshadeep (Harsh) is a Global Lead for Disruptive Technology
at the World Bank’s Environment, Natural Resources & Blue Economy Global
Practice. He holds a Ph.D. in Water and Environment Systems Engineering
from Harvard University, a Masters in Environment and Resource Engineering
from Syracuse, and a B.Tech in Civil Engineering from IIT-Madras. In over
23 years at the World Bank, he has been working on leading several activities
related to environment, water resources, watersheds, and technology and is
located in Washington, D.C.
).
SECTOR
INSIGHT:
.
com
ASPRS is proud to partner with CRC Press, Taylor &
Francis Group.
We are excited to feature books in GIS and
Mapping for a discount price to ASPRS members. Visit the
ASPRS Bookstore at
. Don’t forget to apply code
ASP25 to SAVE 25% on entire purchase* + FREE Shipping
. Can’t
find what you’re looking for? Visit crcpress.com to shop and
save on all of their books.
*Valid for online orders only and excludes eBooks.
