Wednesday, June 27, 2007

ESRI UC - technical update

Originally I didn't plan to post such detailed summary of presentations I went to but friend of mine, Jithen Singh, wants to put it on his blog, Scrappad. Then I figured why not. Just a few notes about it; these are the details I think are worth mentioning, from my own perspective. I have been in the GIS since late 80's and I do a lot of training courses. Because of this you may find some sessions to be quite brief.

Anyway, here is the more to the point technical summary of the sessions I have attended.

VISUALIZATION WITH ARCGLOBE

  • Use ArcGIS Online to download template documents. These may have higher resolution imagery available than default ones, at least for USA.
  • There is a façade tool from ArcScripts (id 14040) that improved 3d building display
  • Use layer properties to have multiple displays of 3D data (no texture, low resolution texture, hi resolution texture)
  • www.mayang.com/textures is free resource for download of various textures
  • ‘3D graphics’ is a new toolbar at 9.3
  • KML will have separate toolbar at 9.3
  • ‘Find nearby’ tool will utilize ArcGIS web services
  • Use ‘Cache deployment wizard’ to manage and deploy cache
LABELING, ANNOTATION EDITING AND TEXT PLACEMENT
  • Straight option for polygon labeling is using longest axis of the polygon


ARCSDE CONFIGURATION AND UPGRADE STRATEGY

  • We were given handout sheet with steps for upgrade (client and server, PC and Unix)
  • Unicode support is enabled by default in 9.2. If not needed turn it off
  • High precision allows storage of 4 503 599 627 370 000 geodatabase units (exact number)
  • If using application server connection upgrade clients first
  • If using direct connect upgrade simultaneously
  • KB 31494 discusses support for 32 and 64 bit ArcSDE


MOBILE GIS USER GROUP MEETING

  • Windows Mobile 6 comes in 3 flavors:
    • Standard (no support for touch screen, 2 tier security)
    • Professional (support for touch screen, 3 tier security, includes Remote Desktop Mobile client)
    • Classic (for PDA, non smart phone, etc)
  • SILVERLIGHT RUNS ON LINUX

ADVANCED MOBILE BUILDER

  • Calculate value tool is designed for model builder, can use code block
  • 'Merge Branch' tool should be used in combination with precondition property to complete if/then
  • Use !shape.area! statement in expression(s) to get access to area of features in a shapefile without adding and populating new field
  • Probably there was more but I got sick and had to leave…


ARCGIS SERVER ADMINISTRATION, CONFIGURATION, TUNING AND OPTIMIZATION

  • ESRI’s recommended connection type is direct connect (open to discussion IMHO)i
  • For dynamic map services:
    • Use minimum number of required layers
    • Hide unnecessary fields
    • Use simple or character marker symbols
    • Use EMF instead of BMP for symbol fill
    • Use integer fields for symbol values instead of character values
    • Use ESRI_Optimized style (>50% speed increase)
    • Use annotation instead of labels
    • Build indices on fields
    • Use label weight and label priority sparingly
    • Avoid special effects on text (halo, background, etc)
    • Avoid text with 60+ size
    • Avoid Maplex
  • For cached services set number to number of CPUs or Cores + 1
  • Simplify data (generalize) and models
  • Us in memory data for geoprocessing (models)
  • If you have more than 4 threads per SOC process use high isolation
  • For polled instances use 2-4 instances per CPU or core
  • Citrix NetScaler can boost up network performance
  • Have at least 2 GB of RAM per CPU or core
  • Reduce number of services per server
  • Use NAS, RAID and fast SCSI disks
  • Use Server Statistics in ArcCatalog for investigation of possible issues
  • Use Microsoft’s Fiddler for investigation of HTTP communication (www.fiddlertool.com)
  • On XP disable Simple File Sharing
  • Use web stress tools like MS application Test Centre or Jakarta’s Jmeter

MANAGING DISTRIBUTED DATA WITH GEODATABASE REPLICATION

  • Replication can be used with other data distribution techniques like Mobile ADF
  • You can replicate specific version, dataset of features
  • 3 replication types are
    • Check In / Check Out – parent must be ArcSDE
    • One way – can be simple of full (support for networks and topologies)
    • Two way
  • YOU MUST HAVE WRITE ACCESS TO DATA
  • All data must be registered as versioned
  • All data must have GLOBALID column
  • All data must be in high precision
  • For terrains, only components are replicated, not the terrain itself
  • Metadata is replicated this is in the works for 9.3
  • Connected synchronization – both GDBs are on the network, can send changes both ways or one way
  • Disconnected synchronization – messaging done by user, gdbs are not on the network
  • Send acknowledgment messages to reduce amount of information sent, also helps cleanup of data
  • Replica reconcile policies
    • Favor database
    • Favor import – apply imported value
    • Manual – user must resolve conflicts
  • Use Synchronize Changes GP tool for automation
  • For schema changes
    • Field dropped – skips the field
    • Apply schema before synchronization
  • There is new feature class, replica footprint created by geoprocessing tool. It includes replica properties
  • Changes in 9.3
    • Extending replicas to file and personal gdb
    • Support for XML files over 1 GB
    • Improved logging in case of unsuccessful synchronization

ADVANCED CARTOGRAPHY IN ARCGIS

  • Check samples in developer kit to create your own geometric effects
  • New at 9.3
    • Greater selection handles
    • More keyboard shortcuts
    • Dialogs to convert units of measure
    • WYSISWG for editing representations
    • Disperse markers symbols GP tool

ENTERPRISE GEODATABASE TUNING TIPS AND TRICKS

  • Client’s responsibility
    • Better workflow design
    • Better geodatabase design
    • Optimized ArcObjects code design
    • Optimized MXD
    • Testing
    • Understanding the technology
  • Remote SDE install - for unsupported database
  • Remote SDE install, CPU clock is the key, RAM is secondary
  • Check PERMISSION_CACHE_TRASHHOLD keyword for SQL server at 9.2
  • Use SP2 for SQL Server 2005
  • Use built-in database roles like db_datareader (reduces time for reading of system tables)
  • Sde commands use single precision
  • User can control logging mode - ERRLOGMODE keyword
    • T- time stamp
    • C – computer
  • Read KB 25129 about TCPKEEPALIVE setting


On personal note, it was a great opportunity to meet ESRI staff and other people whose books or papers I recommend to my students. This includes Cynthia Brewer, Peter Jolly and other.

1 comment:

  1. Oi, achei teu blog pelo google tá bem interessante gostei desse post. Quando der dá uma passada pelo meu blog, é sobre camisetas personalizadas, mostra passo a passo como criar uma camiseta personalizada bem maneira. Até mais.

    ReplyDelete