Personal Information

The LasViewer application does not collect or transmit any user’s personal information. No personal information is used, stored, secured or disclosed by services this application works with.

Internet Access

The LasViewer app can can connect to and access web-pages from the internet. This is to provide links to web-pages for user instructions, and is only done upon user selection. 

Statistical Information

This app itself does not capture any statistical information. 

Report Violations or get more information

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Overview

LasViewer software can be used for viewing and plotting oilfield well-log data, that is stored in LAS files.

LasViewer is a 64 bit application, and is available for download from the Microsoft Store for Windows-10, at https://www.microsoft.com/store/apps/9NL0KSPML72D

 LAS files are ASCII files that are used to store and share oilfield well-log data.

The current version supports LAS version 2.0 files. A valid LAS version 2.0  file contains five sections that include the ~Version, ~Well, ~Curves, ~Parameters and ~Ascii sections.  These are also referred to as the ~V, ~W, ~C, ~P and ~A sections. The ~P section optional, all the other sections are mandatory.

 

Loading Data

 A LAS file can be loaded by either selecting the File->Load LAS File option under the main menu. Alternatively, just drag and drop the file onto the tree-view list area. Drag and drop supports loading multiple files with one action.

Once a LAS file has been loaded, all the curves in the file will be shown in the tree-view list on the left side. The hierarchy of the tree-view is shown below.

- Company Name 
- Well Name
- Dataset Name (LAS file)

All LAS files from the same well will be grouped together. To view the data from another LAS file, click on the LAS filename in the tree-view.

Clicking on either of the Company Name or Well Name will display the information about the well that was loaded from the LAS file.

Right clicking on the Dataset (LAS filename) also gives options for viewing the raw data from the ~V, ~W, ~C  and ~P sections of the LAS file header. Note that the "Right Click" menu is not available until a normal click has first been performed on the Dataset.

 

Quickview 

The window directly to the left of the main form is the QuickView plot. After a LAS file is loaded, the first curve in the list which should be the Depth curve, will be displayed here. Clicking on a curve name in the tree-view list will cause that curve to be displayed in the QuickView plot. If the "Alt" key is depressed while clicking on a curve name, the curve data will be displayed instead.

The curves are displayed on the QuickView plot with a fixed format. The depth is scaled so that the whole data set fits on the page. Log curves are displayed with a pre-defined format. Log curves can wrap once, when they exceed the plot scale. A curve will change color to pink, when it is wrapped.

For log curves that don't have a format that is pre-defined, these are displayed with a linear scale and scaled so that the minimum and maximum values fit into the window. They are also plotted with a gray curve color.

Right clicking on the QuickView plot gives an option for copying the current image, so it can then be pasted into another document.

  

The figure above shows two features available after loading the data. On the left is a data view that is obtained by holding the "Alt" key down when clicking on a log channel name. The drop-down menu that appears when right-clicking on either the Company, Well and Dataset name is shown on the right.

 

Deleting Data

Right clicking on the tree-view give options for deleting a Dataset, for deleting all the data from a Well, and for deleting all the data from a Company. There must always be at least one Dataset left in a well, and always one Well left in a Company. To delete these items, simply select item that has a higher heirarchy.

Individual channels in a LAS can be deleted the same way. To delete multiple channels, select the first channel as normal, then hold down the control key to select subsequent channels. Finally, right click on the highlighted channel and select "delete".

 

Log Plot

The "Log Plot" panel is on the right side of the main form is for making composite log plots and cross-plots.  

The Log Plot panel is used for making multi-column plots and allows user defined formatting. As with the QuickView plot, the curves are initially displayed using pre-defined formatting options, but these can be easily changed later.

 

 

 Right clicking on a specific track of the plot shows a drop-down menu. Some of these menu options are track dependent, while others apply to the entire plot.

 Drop down menu options from the Log Plot panel

  • Add track - adds a new log track to the right of the last track.
  • Insert track - inserts a new track immediately to the right of the currently selected track.
  • Delete track - deletes the currently selected track.
  • Add Log Curve - presents a selection of log curves to be added to the currently selected track.
  • Clear Log Curves - deletes all log curves from the currently selected track.
  • Change Track width - by default, a log track is 200 pixels wide. This menu offers alternatives values for the track width.
  • Change Log Plot parameters - to change the plotting scale and other parameters for all the logs displayed on the currently selected track.
  • Depth axis scale - by default, the depth scale is chosen to fit all the data in the display window. The menu option allows change the depth scale.
  • Copy Image - copies the current plot to the clipboard, so it can be pasted into another document.
  • Print - prints the current image. Printing to a PDF file is a good option, to save the log plot to a disk file.
  • Reset (delete all) - deletes all the tracks and plots reverts back to initial conditions.

Log display with drop-down menu.

 

 On the right side of the Log Plot panel is the Crossplot button. Clicking this will bring up a new window that allows cross-plotting curves of the currently selected data set.

The main form and the cross-plot display.

 

Depth Units.

The depth units are specified inside the LAS file, and the file will be loaded referenced to those depths units. The depth unit can be changed after loading by right clicking on the dataset, and selecting the "change depth unit" option.

 

VSP waveform data

The current version also supports displaying VSP waveform data that is loaded from files in LDF format.

The process of loading and displaying LDF file is similar to LAS files discussed above. The QuickView plot will only show a depth-time plot, while the waveforms can be viewed from the Log Plot panel. When VSP waveform data is loaded, some of the options available in the drop-down menu will be different, but these should be self explanatory, if loading and displaying LAS files is understood.

One complication with LDF files (and also with SEGY files in a future release), is that these files do not contain information on the Company Name or Well Name. Therefore, these have to be specified upon load. If other data has already been loaded, then the existing Company/Well names will be offered as choices. Similarly, the depth unit required for the data to displayed in will need to be specified.

 

Version History

Version 2.0.12

26-May-2018.  First release

  

Privacy Policy

Link to Windows Store Privacy Policy for LasViewer, that is required for Windows Store Apps.

 

 

 

Overview

GeoTime software can be used for the following.

  • Convert Latitude-Longitude to UTM, in WGS-84.
  • Convert UTM to Latitude-Longitude, in WGS-84.
  • Interactively pick locations on map to determine the Latitude/Longitude and UTM of that point, and vice versa.
  • Compute the Julian Day for any date-time value.
  • Compute the Sidereal Time for the current location picked.
  • Compute the Sunrise and Sunset times for the current location picked.
  • Compute the exact times for Solstice and Equinox for any year.
  • Show plots of Earth-Sun Analemma for the selected location.
  • Conversions of date to the Islamic and Hebrew calendars.
  • Compute the current time on Mars

Additionally, it can convert from WGS-84 to some other datum's. In it's presence form, these conversion are for some countries I am familiar with and include Malaysia, Thailand and Australia, but other datum's can be easily added upon request. There is also provision for Borneo Rectified Skewed Orthomorphic (BRSO) when using the Timbalai datum.

GeoTimeConverter is a 32/64 bit application for Windows 10, and is available on the Windows Store at this link

  

 

The date and time is selected in the "local time" of the location that has been previously selected. Several methods are available for selecting values of date and time, include:

  • Select a value from the drop-down calendar.
  • Using the up and down arrows.
  • Entering values of date and time directly to the Y/M/D and H/M/S text boxes.
  • Clicking on the Current Time or UTC 00:00 buttons

If a different location is later selected, then the local time is converted to a new value by assuming UTC time is unchanged.

The three tabs labeled "Local Time", Sunrise-Sunset" and "Other Calendars" show additional time and date computations. The sunrise and sunset times are referenced to the local Daylight Savings Time, should that be applicable. Noting that the sunrise/sunset plots, by default, are not referenced to DST times. The conversions to the Hebrew and Islamic calendars can be found under the Other Calendars tab. If the page is expanded in size, the information from the tabs will be shown all together.

 

More details on selecting a location

The map displayed is from the Microsoft Bing Maps API. An internet connection is required to view the map.

To select a location from the Map, simply double click at the desired location.

If the Latitude and/or Longitude values are manually updated, the convert button will need to be clicked. After clicking this button, the UTM's are re-computed and the Map location updated. The convert button will turn green as the data is being entered, indicating that it will need to pressed. Similarly when updated the UTM values.

The Time Zone for a location is also determined for each location. The  "time-of-day" of the computed and the data is internally referenced to UTC time, so when the time zone is changed, the UTC time will remain unchanged and  the local time will get updated. There are 3 methods of determining the time zone.

The first time zone method is to use the PC clock. This method is probably only useful when you are selecting locations that are nearby to and in your local time zone.

The second and default method is to determine the time zone from the selected location, which returns the time zone value for either standard time or summer time (DST) depending on the time of the year. The input information are the latitude and longitude of the selected location. If a location is selected over the ocean, a time zone value computed from a 15 deg segment of longitude is returned. 

The third time zone method is to set the time zone value manually. This method would be used when there is no active internet connect, or in the rare case when the method 2 doesn't give a correct value.

Up to 10 sets of location data can be saved to the local computer, which will be automatically re-loaded when the app is next restarted. To save a current location setting, click on an empty cell, then select the Save button. If a cell already contains data, it will be over written. To restoring data from a cell, click on the cell to be restored, then select the Restore button.

 

Sunrise, Sunset and Analemma plots.

These plots can be accessed by clicking on the second button under the hamburger icon on the far left. By default, they are both displayed using local time that does not have any Daylight Saving Time corrections applied (if DST is applicable to the selected location). Since the sunrise and sunset times display on the main map screen are corrected to Daylight Savings Time, then there may be a hour offset between the two at some times of the year. To plot the data with Daylight Savings Time, then click on the check box at the bottom of the page.

 

 

Keys for the Bing Maps API

The map displayed is from the Microsoft Bing Maps API. This API requires an active internet connection, so if no internet connection is available then the map does not display or update. Additionally, an API key is required for it to function and a  key is embedded in the software.

It is possible that at some time in the future, the Bing Maps API key that is embedded in the software will cease to work, either due to expiration or over-use. You will see a message on the map saying "Invalid Credentials. Sign up for a developer account".

In that situation, you can obtain your own key from  https://msdn.microsoft.com/en-us/library/ff428642.aspx and load it from the option under the Tools menu. Use your regular Microsoft username and password.

This new personal key may become disconnected from GeoTime software when you re-install or update GeoTime, so will need to be entered again.

As far as I know, for fairly limited use, the Bing Maps key is free use up to a certain number of daily transactions (which is quite high), even though it is called a "billable key".  Although I dont believe there is any extra cost associated with getting a Bing Maps API key for low level usage, but if there is any extra cost, then this is extra and above any cost that may have been paid to acquire the GeoTime app.

When obtaining a key, select Key Type=Basic and Application Type=Public Windows App (8.x and earlier). The Application Name is GeoTimeConverter.

 

 

 

References

  1. Astronomical Algorithms, 2nd Edition. Jean Meeus.

 

Version History

 

Version 2.0.15

04-Oct-2017. Added sunrise and sunset plots. Added Analemma plots. Added conversions of date to the Hebrew and Islamic calendars.

 

Version 2.0.11

19-Sep-2017. Added some datum conversion options. Preliminary implementation that only included datum's from Australia, Malaysia and Thailand.

 

Version 2.0.9

12-Sep-2017. First release

 

 

 

 Privacy Policy

Link to Windows Store Privacy Policy for GeoTime, that is required for Windows Store Apps.

.

Personal Information

The GeoTime application does not collect or transmit any user’s personal information. No personal information is used, stored, secured or disclosed by services this application works with.

Technical Information

The GeoTime app does store user defined values of latitude and longitude in the Windows-10 Appdata directory.

This is to enable the data to be re-loaded when next re-starting the app, so the user can continue using the app without having to re-enter this data. This latitude-longitude data may or may not correspond to the user's location, either past, present or future. These locations simply depend on what the user has entered or selected. This data is kept within the user's PC in the Appdata directory and is not transmitted elsewhere.

Third Party services

The map used with in this app is from the Microsoft Bing Maps API.

Statistical Information

This app itself does not capture any statistical information. However, it seems that Microsoft themselves do capture some form of statistical data for Windows Store apps, but this is outside of and independent from this app.

Report Violations or get more information

If you would like to report any violations of this policy or get more information, please contact us at This email address is being protected from spambots. You need JavaScript enabled to view it.

 

Personal Information

The StarStack application does not collect or transmit any user’s personal information. No personal information is used, stored, secured or disclosed by services this application works with.

Technical Information

 The StarStack app can can connect to and access webpages from the internet. This is to provide links to webpages for user instructions, and is only done upon user selection. 

 

Statistical Information

This app itself does not capture any statistical information. However, it seems that Microsoft themselves do capture some form of statistical data for Windows Store apps, but this is outside of and independent from this app.

Report Violations or get more information

If you would like to report any violations of this policy or get more information, please contact us at This email address is being protected from spambots. You need JavaScript enabled to view it.