15 Nov
2013
15 Nov
'13
8:03 a.m.
Krishnan,
HDF was data format, all climate data is stored on HDF format (I
experience writing C code for this data format on SPARC computers long
time ago and from HDF I converted to MySQL ! ). CTPP is just a flat
data set, txt. Converting into HDF is a different complicated story
and on a wrong direction.
Linking data tables from many tables has to be done using database
engine. MS Access won't cut it. M$ SQL is expensive. Free, Open Source
is the only way and fast.
TransCAD... I never test the limit. But linking simple tables is ok.
Large and many tables ? Better use data modeler software and link to
database engine.
Hary(ono) Prawiranata
Transportation Analyst/Modeler
Tri-County Regional Planning Commission
3135 Pine Tree Rd. Ste 2C
Lansing, MI 48911
On Thu, Nov 14, 2013 at 9:58 PM, Krishnan Viswanathan
<krisviswanathan(a)gmail.com> wrote:
Mara
Besides SQL server I have the following suggestions:
1) the ff package in R (
http://www.bnosac.be/index.php/blog/22-if-you-are-into-large-data-and-work-…)
2) HDF5 seems like a decent option though I have not used it. Link to rhdf5
( http://bioconductor.org/packages/release/bioc/html/rhdf5.html). Also,
SFCTA has some code for getting data into and out of HDF5 (
https://github.com/sfcta/TAutils/tree/master/hdf5)
3) I have found TransCAD to be efficient in processing large datasets.
Hope this helps.
Krishnan
I downloaded the Maryland state raw data (the whole enchilada) that Penelope
was good enough to provide me. It came with documentation that clearly
explains what needs to be done but I am being hampered by the sheer size of
the dataset. It's 10 GB and that's without going into joining tables,
transposing them to meet my needs, etc. Even breaking the parts into
different databases it can't be handled in Access. I can fit Part 1 into an
ESRI geodatabase but I don't have the flexibility in linking tables that
Access has.
Does anyone have any suggestions for dealing with large databases? SQL
server is one option. Are there others?
Mara Kaminowitz, GISP
GIS Coordinator
.........................................................................
Baltimore Metropolitan Council
Offices @ McHenry Row
1500 Whetstone Way
Suite 300
Baltimore, MD 21230
410-732-0500 ext. 1030
mkaminowitz(a)baltometro.org
www.baltometro.org
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